An example of competitive inhibition of an enzyme is the inhibition of

a) succinic dehydrogenase by malonic acid | succinic dehydrogenase by malonic acid

Insulin is made up of _______ and _______.

b) glucose and fructose | Insulin is a polysaccharide made up of glucose and fructose.

Enzymes increase the rate of reaction by

a) lowering activation energy | Enzymes increase the rate of reaction by decreasing the activation energy.

Which of the following statements regarding enzyme inhibition is correct?

c) Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme | Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme

Which of the following is not a pyrimidine?

c) Guanine | Guanine is a purine.

Assertion: Arachidic acid is an unsaturated fatty acid Reason: There are one or more double bonds between carbon atoms in unsaturated fatty acids

d) Both Assertion and Reason are false | Both Assertion and Reason are false

Which of the following is not a polysaccharide?

a) Lactose | Lactose is a disaccharide made up of glucose and galactose.

Inulin is made up of _______ and _______

b) glucose and fructose | Inulin is a polysaccharide made up of glucose and fructose

NADP contains vitamin ______

c) B3 | B3 also named as niacin.

With reference to enzymes, which one of the following statements is true?

b) Coenzyme = Apoenzyme + Holoenzyme | Holoenzyme = Apoenzyme + Coenzyme

The fastest enzyme known is

b) carbonic anhydrase | The fastest enzyme known is carbonic anhydrase. It converts 106 molecules of carbon dioxide molecules per second.

d) lipid | Lecithin is a phospholipid.

The minimum amount of energy required to initiate a chemical reaction is called

b) activation energy | The minimum amount of energy required to initiate a chemical reaction is called activation energy

Nitrogenous bases present in DNA

b) Adenine, guanine, cytosine, thymine | Adenine, guanine, cytosine, thymine

Metabolic intermediates found in living system which are essential for growth and life is called___________

d) Primary metabolites | Primary metabolites

Enormous diversity of protein molecules is due to

b) Sequence of amino acids | Sequence of amino acids

Anti-parallel strands of a DNA molecule mean that

b) Phosphate groups at the start of two DNA strands (poles) are in opposite position | Phosphate groups at the start of two DNA strands (poles) are in opposite position

The introduction of t-DNA into plants involves

d) Infection of the plant by Agrobacterium tumefaciens |

Inhibitor binds to the active site of the enzyme. Hence blocking the reaction. This is an example of

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Q.15. Inhibitor binds to the active site of the enzyme. Hence blocking the reaction. This is an example of

allosteric inhibition
feedback inhibition
uncompetitive inhibition
competitive inhibition

Answer: (d) competitive inhibition
Explanation: When substrate binds to the active site of the enzyme, it completes the reaction.When inhibitor binds to the active site of the enzyme, it blocks the reaction

Biomolecules Class 11 Biology Test | MCQs For NEET

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This practice test includes 25 important multiple-choice objective questions from the chapter Biomolecules Class 11th. Start Test without Login in
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Q.No.	Que title	Option 1 (a)	Option 2 (b)	Option 3 (c)	Option 4 (d)
1	Feedback inhibition of enzymes is affected by which of the following	enzyme	substrate	end products	intermediate end products
2	An example of competitive inhibition of an enzyme is the inhibition of	succinic dehydrogenase by malonic acid	cytochrome oxidase by cyanide	hexokinase by glucose-6-phosphate	carbonic anhydrase by carbon dioxide
3	Insulin is made up of _______ and _______.	glucose and fructose	glucose and fructose	fructose and mannose	mannose and glucose
4	Enzymes increase the rate of reaction by	lowering activation energy	increasing activation energy	increasing temperature and pH	decreasing temperature and pH
5	Which of the following statements regarding enzyme inhibition is correct?	Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein	Non-competitive inhibitors often bind to the enzyme irreversibly	Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme	Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate
6	Which of the following is not a pyrimidine?	Uracil	Cytosine	Guanine	Thymine
7	Hydrolysis of starch occurs with the help of	Peptidase	Amylase	Sucrose	Lipase
8	Assertion: Arachidic acid is an unsaturated fatty acid Reason: There are one or more double bonds between carbon atoms in unsaturated fatty acids	Both Assertion and Reason are true and Reason is the correct explanation of the Assertion	Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion	Assertion is true, but Reason is false.	Both Assertion and Reason are false
9	Which of the following influence feedback inhibition of enzyme?	End product	External factors	Enzyme	Substrate
10	Which of the following is not a polysaccharide?	Lactose	Starch	Glycogen	Dextrin
11	Inulin is made up of _______ and _______	glucose and fructose	glucose and fructose	fructose and mannose	mannose and glucose
12	A protein having both structural and enzymatic traits is	Collagen	Trypsin	Myosin	Actin
13	NADP contains vitamin ______	B1	B2	B3	B12
14	With reference to enzymes, which one of the following statements is true?	Apoenzyme = Holoenzyme + Coenzyme	Coenzyme = Apoenzyme + Holoenzyme	Holoenzyme = Apoenzyme + Coenzyme	Holoenzyme = Coenzyme ? Apoenzyme
15	Inhibitor binds to the active site of the enzyme. Hence blocking the reaction. This is an example of	allosteric inhibition	feedback inhibition	uncompetitive inhibition	competitive inhibition
16	The fastest enzyme known is	DNA polymerase	carbonic anhydrase	carbonic dehydrogenase	DNA ligase
17	Lecithin is a	polysaccharide	protein	nucleic acid	lipid
18	The minimum amount of energy required to initiate a chemical reaction is called	enzymatic energy	activation energy	substrate energy	initiation energy
19	Enzymes, vitamins and hormones are common in	Enhancing oxidative metabolism	Being synthesised in the body of organisms	Being proteinaceous	Regulating metabolism
20	Nitrogenous bases present in DNA	Adenine, guanine, cytosine, uracil	Adenine, guanine, cytosine, thymine	Adenine, thymine, uracil	Guanine, uracil
21	Metabolic intermediates found in living system which are essential for growth and life is called___________	Saponins	Tannins	Secondary metabolite	Primary metabolites
22	Enormous diversity of protein molecules is due to	R groups of amino acids	Sequence of amino acids	Peptide bonds	Amino groups of amino acids
23	Anti-parallel strands of a DNA molecule mean that	One strand turns anticlockwise	Phosphate groups at the start of two DNA strands (poles) are in opposite position	Phosphate groups of two DNA strands at their ends share the same position	One strand turns clockwise
24	The introduction of t-DNA into plants involves	Altering the pH of the soil, then heat shocking the plants	Exposing the plants to cold for a brief period	Allowing the plant roots to stand in water	Infection of the plant by Agrobacterium tumefaciens
25	The most common monomer of carbohydrates is	Sucrose	Fructose	Maltose	Glucose

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