Biomolecules Class 11 MCQ

Q: What are biomolecules?

Biomolecules are organic molecules that are essential for life processes. They include carbohydrates, lipids, proteins, and nucleic acids.

Q: What is the difference between primary and secondary metabolites?

Primary metabolites are directly involved in growth, development, and reproduction, while secondary metabolites are not essential for these processes but have other functions like defense or signaling.

Q: What are the four levels of protein structure?

Primary (amino acid sequence), secondary (local folding), tertiary (3D structure), and quaternary (arrangement of multiple subunits).

Q: How do enzymes work?

Enzymes are biological catalysts that speed up reactions by lowering the activation energy. They have an active site where the substrate binds.

Q: What factors affect enzyme activity?

Temperature, pH, substrate concentration, and the presence of inhibitors can all affect enzyme activity.

Question 1

Question 1: Which element is found in higher relative abundance in living organisms compared to the Earth’s crust?

A. SiliconB. AluminumC. CarbonD. Oxygen

Answer

C. Carbon. Living organisms have a higher relative abundance of carbon and hydrogen compared to the Earth’s crust. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 2

Question 2: What is the primary component of the acid-insoluble fraction in living tissues?

A. ProteinsB. LipidsC. CarbohydratesD. Nucleic acids

Answer

A. Proteins. The acid-insoluble fraction primarily consists of proteins. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 3

Question 3: Which technique is commonly used to analyze the elemental composition of a sample?

A. ChromatographyB. SpectroscopyC. MicroscopyD. Elemental analysis

Answer

D. Elemental analysis. Elemental analysis is performed to determine the elemental composition of a sample. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 4

Question 4: What type of organic compounds are predominantly found in living organisms?

A. Inorganic compoundsB. Synthetic polymersC. BiomoleculesD. Minerals

Answer

C. Biomolecules. Living organisms are primarily composed of organic compounds called biomolecules. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 5

Question 5: Which of the following is NOT a key difference between the elemental composition of living tissues and the Earth’s crust?

A. Higher relative abundance of carbon in living tissuesB. Presence of unique elements in living tissues not found in the Earth’s crustC. Higher relative abundance of hydrogen in living tissuesD. Different ratios of elements in living tissues compared to the Earth’s crust

Answer

B. Presence of unique elements in living tissues not found in the Earth’s crust. All elements found in living tissues are also present in the Earth’s crust, but their relative abundance differs. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 6

Question 6: What is the primary function of primary metabolites?

A. Defense against predatorsB. Communication between organismsC. Essential for normal physiological processesD. Providing structural support

Answer

C. Essential for normal physiological processes. Primary metabolites are involved in essential functions like growth, development, and reproduction. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 7

Question 7: Which of the following is NOT a category of secondary metabolites?

A. CarbohydratesB. PigmentsC. AlkaloidsD. Terpenoids

Answer

A. Carbohydrates. Carbohydrates are primary metabolites, not secondary metabolites. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 8

Question 8: What is the role of secondary metabolites in plants?

A. Energy productionB. Defense against herbivoresC. PhotosynthesisD. Water transport

Answer

B. Defense against herbivores. Many secondary metabolites, like toxins and lectins, help protect plants from herbivores. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 9

Question 9: Which of the following is an example of a secondary metabolite used as a drug?

A. GlucoseB. MorphineC. InsulinD. Hemoglobin

Answer

B. Morphine. Morphine is an alkaloid derived from the opium poppy and is used as a pain reliever. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 10

Question 10: How do secondary metabolites contribute to human welfare?

A. By providing essential nutrientsB. By serving as a source of energyC. By acting as drugs, pigments, and flavoring agentsD. By regulating pH balance

Answer

C. By acting as drugs, pigments, and flavoring agents. Secondary metabolites have various applications in medicine, industry, and food. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 11

Question 11: Which of the following is a polymeric substance that is considered a secondary metabolite?

A. CelluloseB. RubberC. StarchD. Glycogen

Answer

B. Rubber. Rubber is a terpenoid and is considered a secondary metabolite. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 12

Question 12: What role do pigments play as secondary metabolites?

A. Catalyzing biochemical reactionsB. Providing structural supportC. Imparting color to flowers and fruitsD. Transporting oxygen

Answer

C. Imparting color to flowers and fruits. Pigments like carotenoids and anthocyanins give color to various plant parts. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 13

Question 13: How do essential oils contribute to ecological interactions?

A. By attracting pollinatorsB. By providing camouflageC. By regulating temperatureD. By storing energy

Answer

A. By attracting pollinators. Essential oils often have strong fragrances that attract insects for pollination. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 14

Question 14: Which of the following is an example of a lectin?

A. CaffeineB. NicotineC. RicinD. Quinine

Answer

C. Ricin. Ricin is a toxic lectin found in castor beans. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 15

Question 15: Why are toxins considered secondary metabolites?

A. They are essential for normal growth and development.B. They are involved in primary metabolic pathways.C. They are not directly involved in essential physiological processes.D. They are produced in large quantities by all organisms.

Answer

C. They are not directly involved in essential physiological processes. Toxins are often produced for defense or competition, not for basic metabolic functions. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 16

Question 16: What is the main distinguishing factor between macromolecules and micromolecules?

A. Their physical stateB. Their elemental compositionC. Their molecular weightD. Their solubility in water

Answer

C. Their molecular weight. Macromolecules have a high molecular weight, typically over 1000 daltons. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 17

Question 17: Which of the following is NOT a characteristic of macromolecules?

A. They are large polymers.B. They have a low molecular weight.C. They are formed by the polymerization of monomers.D. They play crucial roles in living organisms.

Answer

B. They have a low molecular weight. Macromolecules have a high molecular weight. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 18

Question 18: Why are lipids considered macromolecules despite having a smaller molecular weight than other macromolecules?

A. They form large aggregates.B. They are insoluble in water.C. They contain long hydrocarbon chains.D. They play a crucial role in energy storage.

Answer

A. They form large aggregates. Lipids aggregate to form larger structures, making them functionally similar to other macromolecules. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 19

Question 19: Which of the following is an example of a micromolecule?

A. ProteinB. GlucoseC. DNAD. Starch

Answer

B. Glucose. Glucose is a simple sugar with a low molecular weight. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 20

Question 20: How are macromolecules formed?

A. By the breakdown of smaller moleculesB. By the polymerization of monomersC. By the absorption of energyD. By the release of water

Answer

B. By the polymerization of monomers. Macromolecules are formed by joining repeating subunits called monomers. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 21

Question 21: What type of bond links amino acids together in a polypeptide chain?

A. Glycosidic bondB. Phosphodiester bondC. Hydrogen bondD. Peptide bond

Answer

D. Peptide bond. Peptide bonds link the carboxyl group of one amino acid to the amino group of another. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 22

Question 22: What is the difference between essential and non-essential amino acids?

A. Essential amino acids are more important for the body.B. Essential amino acids cannot be synthesized by the body and must be obtained from the diet.C. Non-essential amino acids are not used to build proteins.D. Essential amino acids are only found in animal products.

Answer

B. Essential amino acids cannot be synthesized by the body and must be obtained from the diet. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 23

Question 23: Which of the following is NOT a function of proteins?

A. Energy storageB. Transport of moleculesC. Defense against pathogensD. Hormone production

Answer

A. Energy storage. While proteins can be metabolized for energy, their primary functions are not related to energy storage. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 24

Question 24: What is the most abundant protein in the animal kingdom?

A. CollagenB. RuBisCOC. InsulinD. Hemoglobin

Answer

A. Collagen. Collagen is a structural protein found in connective tissues. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 25

Question 25: What is the most abundant protein in the plant kingdom?

A. CollagenB. RuBisCOC. InsulinD. Hemoglobin

Answer

B. RuBisCO. RuBisCO is an enzyme involved in photosynthesis. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 26

Question 26: Which of the following is an example of a protein hormone?

A. GlucoseB. InsulinC. CholesterolD. Cellulose

Answer

B. Insulin. Insulin is a hormone that regulates blood sugar levels. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 27

Question 27: How do proteins contribute to defense against pathogens?

A. By acting as enzymesB. By forming antibodiesC. By providing structural supportD. By transporting nutrients

Answer

B. By forming antibodies. Antibodies are proteins that recognize and neutralize foreign invaders. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 28

Question 28: What is the primary function of transport proteins?

A. To catalyze biochemical reactionsB. To move molecules across cell membranesC. To provide structural supportD. To store genetic information

Answer

B. To move molecules across cell membranes. Transport proteins facilitate the movement of molecules across cell membranes. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 29

Question 29: Which of the following is an example of a structural protein?

A. InsulinB. HemoglobinC. CollagenD. Amylase

Answer

C. Collagen. Collagen is a major component of connective tissues, providing structural support. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 30

Question 30: Which of the following proteins is involved in oxygen transport?

A. InsulinB. HemoglobinC. CollagenD. Amylase

Answer

B. Hemoglobin. Hemoglobin binds to oxygen in the lungs and carries it to the tissues. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 31

Question 31: Which of the following is NOT a polysaccharide?

A. CelluloseB. GlucoseC. StarchD. Glycogen

Answer

B. Glucose. Glucose is a monosaccharide, the basic building block of polysaccharides. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 32

Question 32: What is the primary function of cellulose?

A. Energy storage in plantsB. Structural component of plant cell wallsC. Energy storage in animalsD. Transport of nutrients

Answer

B. Structural component of plant cell walls. Cellulose provides rigidity and strength to plant cells. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 33

Question 33: Which polysaccharide serves as an energy storage molecule in animals?

A. CelluloseB. StarchC. GlycogenD. Inulin

Answer

C. Glycogen. Glycogen is stored in the liver and muscles of animals. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 34

Question 34: What is the difference between the reducing and non-reducing ends of a polysaccharide chain?

A. The reducing end can participate in chemical reactions while the non-reducing end cannot.B. The reducing end has a free anomeric carbon while the non-reducing end does not.C. The reducing end is always on the left side of the chain.D. The reducing end is more stable than the non-reducing end.

Answer

B. The reducing end has a free anomeric carbon while the non-reducing end does not. The anomeric carbon is involved in forming glycosidic bonds. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 35

Question 35: Which polysaccharide forms a helical secondary structure that can hold iodine molecules?

A. CelluloseB. StarchC. InulinD. Chitin

Answer

B. Starch. The helical structure of starch allows it to trap iodine molecules, resulting in a blue color. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 36

Question 36: What is the main component of the exoskeleton of arthropods?

A. CelluloseB. ChitinC. StarchD. Glycogen

Answer

B. Chitin. Chitin is a complex polysaccharide that provides structural support. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 37

Question 37: Which of the following is a homopolysaccharide?

A. ChitinB. InulinC. CelluloseD. All of the above

Answer

D. All of the above. Homopolysaccharides are composed of a single type of monosaccharide. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 38

Question 38: What is the primary function of starch?

A. Energy storage in plantsB. Structural component of plant cell wallsC. Energy storage in animalsD. Transport of nutrients

Answer

A. Energy storage in plants. Starch is stored in granules within plant cells. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 39

Question 39: Which polysaccharide is a polymer of fructose?

A. CelluloseB. StarchC. GlycogenD. Inulin

Answer

D. Inulin. Inulin is a polysaccharide composed of fructose units. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 40

Question 40: Why does cellulose not react with iodine to give a blue color?

A. It does not have a helical structure.B. It is composed of a different type of monosaccharide.C. It is insoluble in water.D. It is a branched molecule.

Answer

A. It does not have a helical structure. The lack of a helical structure prevents cellulose from trapping iodine molecules. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 41

Question 41: What are the building blocks of nucleic acids?

A. Amino acidsB. NucleotidesC. MonosaccharidesD. Fatty acids

Answer

B. Nucleotides. Nucleic acids are polymers of nucleotides. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 42

Question 42: Which of the following is NOT a component of a nucleotide?

A. Phosphate groupB. Pentose sugarC. Amino acidD. Nitrogenous base

Answer

C. Amino acid. Amino acids are the building blocks of proteins, not nucleic acids. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 43

Question 43: Which nitrogenous bases are classified as purines?

A. Adenine and guanineB. Cytosine and thymineC. Adenine and thymineD. Guanine and cytosine

Answer

A. Adenine and guanine. Purines have a double-ring structure. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 44

Question 44: Which type of sugar is found in DNA?

A. RiboseB. DeoxyriboseC. GlucoseD. Fructose

Answer

B. Deoxyribose. Deoxyribose lacks an oxygen atom compared to ribose. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 45

Question 45: Which nitrogenous base is found in RNA but not in DNA?

A. AdenineB. GuanineC. CytosineD. Uracil

Answer

D. Uracil. Uracil replaces thymine in RNA. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 46

Question 46: What is the primary function of nucleic acids?

A. Energy storageB. Structural supportC. Transport of moleculesD. Storage of genetic information

Answer

D. Storage of genetic information. DNA and RNA carry the instructions for building and maintaining an organism. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 47

Question 47: What type of bond links nucleotides together in a nucleic acid chain?

A. Peptide bondB. Glycosidic bondC. Phosphodiester bondD. Hydrogen bond

Answer

C. Phosphodiester bond. Phosphodiester bonds link the phosphate group of one nucleotide to the sugar of another. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 48

Question 48: Which nitrogenous bases are classified as pyrimidines?

A. Adenine and guanineB. Cytosine and thymineC. Adenine and thymineD. Guanine and cytosine

Answer

B. Cytosine and thymine. Pyrimidines have a single-ring structure. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 49

Question 49: Which type of sugar is found in RNA?

A. RiboseB. DeoxyriboseC. GlucoseD. Fructose

Answer

A. Ribose. Ribose is a pentose sugar. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 50

Question 50: What is the difference between a nucleoside and a nucleotide?

A. Nucleosides contain a phosphate group while nucleotides do not.B. Nucleotides contain a phosphate group while nucleosides do not.C. Nucleosides are found in DNA while nucleotides are found in RNA.D. Nucleotides are the building blocks of proteins.

Answer

B. Nucleotides contain a phosphate group while nucleosides do not. Nucleosides consist of a nitrogenous base and a sugar. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 51

Question 51: What determines the primary structure of a protein?

A. The sequence of amino acidsB. The folding pattern of the polypeptide chainC. The arrangement of multiple subunitsD. The presence of disulfide bonds

Answer

A. The sequence of amino acids. The primary structure is simply the order of amino acids in the polypeptide chain. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 52

Question 52: What type of secondary structure is commonly found in proteins?

A. Alpha-helixB. Beta-sheetC. Both A and BD. Neither A nor B

Answer

C. Both A and B. Alpha-helices and beta-sheets are common secondary structures stabilized by hydrogen bonds. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 53

Question 53: What level of protein structure describes the three-dimensional arrangement of the polypeptide chain?

A. PrimaryB. SecondaryC. TertiaryD. Quaternary

Answer

C. Tertiary. The tertiary structure is the overall 3D shape of the polypeptide chain. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 54

Question 54: What type of bond is important for stabilizing the tertiary structure of a protein?

A. Hydrogen bondsB. Disulfide bondsC. Ionic interactionsD. All of the above

Answer

D. All of the above. Various interactions, including hydrogen bonds, disulfide bonds, and ionic interactions, contribute to the stability of the tertiary structure. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 55

Question 55: What level of protein structure describes the arrangement of multiple polypeptide subunits?

A. PrimaryB. SecondaryC. TertiaryD. Quaternary

Answer

D. Quaternary. Some proteins consist of multiple polypeptide chains interacting with each other. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 56

Question 56: What is the term for the amino acid at the beginning of a polypeptide chain?

A. C-terminal amino acidB. N-terminal amino acidC. Central amino acidD. None of the above

Answer

B. N-terminal amino acid. The N-terminal amino acid has a free amino group. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 57

Question 57: What is the term for the amino acid at the end of a polypeptide chain?

A. C-terminal amino acidB. N-terminal amino acidC. Central amino acidD. None of the above

Answer

A. C-terminal amino acid. The C-terminal amino acid has a free carboxyl group. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 58

Question 58: Why is the tertiary structure of a protein important?

A. It determines the protein’s function.B. It allows the protein to interact with other molecules.C. It provides stability to the protein.D. All of the above

Answer

D. All of the above. The tertiary structure is crucial for the protein’s activity and interactions. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 59

Question 59: How many subunits are present in a molecule of adult human hemoglobin?

A. 2B. 3C. 4D. 5

Answer

C. 4. Hemoglobin consists of two alpha subunits and two beta subunits. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 60

Question 60: Which of the following is NOT true about the secondary structure of proteins?

A. It involves hydrogen bonding between amino acids.B. It includes alpha-helices and beta-sheets.C. It determines the sequence of amino acids.D. It contributes to the overall folding of the polypeptide chain.

Answer

C. It determines the sequence of amino acids. The sequence of amino acids is the primary structure. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 61

Question 61: What is the primary function of enzymes?

A. To store genetic informationB. To provide structural supportC. To transport moleculesD. To catalyze biochemical reactions

Answer

D. To catalyze biochemical reactions. Enzymes speed up chemical reactions within cells. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 62

Question 62: What is the term for the specific region of an enzyme where the substrate binds?

A. Allosteric siteB. Active siteC. Binding pocketD. Catalytic domain

Answer

B. Active site. The active site is where the substrate interacts with the enzyme. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 63

Question 63: Which of the following is NOT a characteristic of enzymes?

A. They are highly specific.B. They are not consumed in the reaction.C. They increase the activation energy of a reaction.D. They can be regulated.

Answer

C. They increase the activation energy of a reaction. Enzymes lower the activation energy, making the reaction easier to start. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Question 64

Question 64: What is the main difference between enzyme catalysts and inorganic catalysts?

A. Enzyme catalysts are more efficient.B. Enzyme catalysts are more specific.C. Enzyme catalysts require higher temperatures.D. Enzyme catalysts are not affected by pH.

Answer

B. Enzyme catalysts are more specific. Enzymes typically catalyze only one or a few specific reactions. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

A. An enzyme made of RNA. Ribozymes are catalytic RNA molecules. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

A. Physical changes are reversible, while chemical changes are not. In a chemical change, the composition of matter is altered. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

A. Increasing temperature increases the rate of reaction. Higher temperatures increase the kinetic energy of molecules, leading to more collisions. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

A. A series of chemical reactions that occur in a specific sequence. Metabolic pathways involve a series of interconnected reactions. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

C. End product. The end product is the final molecule produced in a metabolic pathway. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

C. They always require enzymes to occur. While enzymes speed up reactions, many reactions can occur spontaneously, albeit at a slower rate. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

C. Binding of the substrate to the enzyme’s active site. The substrate must first bind to the enzyme before the reaction can proceed. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

B. Transition state. The transition state is a high-energy state that the substrate must reach to be converted into product. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

B. By decreasing the activation energy. Enzymes lower the energy barrier that the substrate must overcome. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

D. Activation energy. Activation energy is the energy needed to initiate a chemical reaction. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

C. It is formed after the product is released. The enzyme-substrate complex is formed before the product is released. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

A. Optimal pH. Different enzymes have different optimal pH values. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

B. Increasing temperature can increase enzyme activity up to a certain point, after which activity declines. High temperatures can denature enzymes. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

B. Enzyme activity reaches a maximum velocity (Vmax). At high substrate concentrations, all enzyme active sites become saturated. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

C. Inhibitor. Inhibitors can bind to the active site or an allosteric site. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

A. An inhibitor that binds to the active site and competes with the substrate. Competitive inhibitors resemble the substrate in structure. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

C. 6. Enzymes are classified into six major classes based on the type of reaction they catalyze. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

C. Oxidoreductases. Oxidoreductases catalyze the transfer of electrons between molecules. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

A. Transferases. Transferases move functional groups between molecules. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

B. Hydrolases. Hydrolases use water to break chemical bonds. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

A. Ligases. Ligases form new bonds between molecules. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

A. A non-protein component required for enzyme activity. Cofactors can be organic or inorganic molecules. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

B. Apoenzyme. The apoenzyme is inactive without the cofactor. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

B. A tightly bound cofactor. Prosthetic groups are usually permanently associated with the enzyme. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

A. A loosely bound cofactor. Coenzymes often act as carriers of electrons or functional groups. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

D. Activator. Activators are molecules that increase enzyme activity but are not considered cofactors. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

D. All of the above. Metal ions can play various roles in enzyme activity. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

C. Niacin. Niacin is a precursor for NAD and NADP. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

A. Holoenzyme. The holoenzyme is the complete, active enzyme. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

A. Heme. Heme is a prosthetic group found in enzymes like catalase and peroxidase. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

B. They are tightly bound to the enzyme. Coenzymes are loosely bound and can be released after the reaction. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

D. All of the above. Cofactors play various essential roles in enzyme function. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

B. NAD. NAD is a coenzyme involved in redox reactions. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

C. Zinc. Zinc is a cofactor for carboxypeptidase, a protease enzyme. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

B. Its activity decreases. The cofactor is essential for the enzyme’s catalytic activity. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Accepted Answer

D. Increasing activation energy. Prosthetic groups, like all cofactors, help decrease activation energy. (Biomolecules Class 11 MCQ by Top100MCQ.com)

Table of Contents

Biomolecules and Their Chemical Composition

Analyzing Chemical Composition

Primary and Secondary Metabolites

Biomacromolecules and Their Structure

Macromolecules versus Micromolecules

Proteins

Polysaccharides

Nucleic Acids

Structure of Proteins

Enzymes and Their Activity

Enzymes as Catalysts

Chemical Reactions and Enzyme Catalysis

Mechanism of Enzyme Action

Factors Affecting Enzyme Activity

Classification and Nomenclature of Enzymes

Co-factors

Most Asked Important Questions on Biomolecules

What are biomolecules?

What is the difference between primary and secondary metabolites?

What are the four levels of protein structure?

How do enzymes work?

What factors affect enzyme activity?

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