MCQ Questions for Class 11 Biology Chapter 9 Biomolecules with Answers

Biomolecules Class 11 Biology MCQs Questions with Answers

Check the below NCERT MCQ Questions for Class 11 Biology Chapter 9 Biomolecules with Answers Pdf free download. MCQ Questions for Class 11 Biology with Answers were prepared based on the latest exam pattern. We have Provided Biomolecules Class 11 Biology MCQs Questions with Answers to help students understand the concept very well.

Class 11 Biology Chapter 9 Quiz

Class 11 Biology Chapter 9 MCQ Online Test

You can refer to NCERT Solutions for Class 11 Biology Chapter 9 Biomolecules to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Biomolecules Class 11 Biology MCQ online test

Q1.	Feedback inhibition of enzymes is affected by which of the following
	A.enzyme
	B.substrate
	C.end products
	D.intermediate end products

Ans: end products

Q2.	An example of competitive inhibition of an enzyme is the inhibition of
	A.succinic dehydrogenase by malonic acid
	B.cytochrome oxidase by cyanide
	C.hexokinase by glucose-6-phosphate
	D.carbonic anhydrase by carbon dioxide

Ans: succinic dehydrogenase by malonic acid

Q3.	Insulin is made up of _______ and _______.
	A.glucose and fructose
	B.glucose and fructose
	C.fructose and mannose
	D.mannose and glucose

Ans: glucose and fructose
Explanation:
Insulin is a polysaccharide made up of glucose and fructose.

Q4.	Enzymes increase the rate of reaction by
	A.lowering activation energy
	B.increasing activation energy
	C.increasing temperature and pH
	D.decreasing temperature and pH

Ans: lowering activation energy
Explanation:
Enzymes increase the rate of reaction by decreasing the activation energy.

Q5.	Which of the following statements regarding enzyme inhibition is correct?
	A.Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein
	B.Non-competitive inhibitors often bind to the enzyme irreversibly
	C.Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme
	D.Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate

Ans: Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme

Q6.	Which of the following is not a pyrimidine?
	A.Uracil
	B.Cytosine
	C.Guanine
	D.Thymine

Ans: Guanine
Explanation:
Guanine is a purine.

Q7.	Hydrolysis of starch occurs with the help of
	A.Peptidase
	B.Amylase
	C.Sucrose
	D.Lipase

Ans: Amylase

Q8.	Assertion: Arachidic acid is an unsaturated fatty acid. Reason: There are one or more double bonds between carbon atoms in unsaturated fatty acids.
	A.Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
	B.Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
	C.Assertion is true, but Reason is false.
	D.Both Assertion and Reason are false

Ans: Both Assertion and Reason are false

Q9.	Which of the following influence feedback inhibition of enzyme?
	A.End product
	B.External factors
	C.Enzyme
	D.Substrate

Ans: End product

Q10.	Which of the following is not a polysaccharide?
	A.Lactose
	B.Starch
	C.Glycogen
	D.Dextrin

Ans: Lactose
Explanation:
Lactose is a disaccharide made up of glucose and galactose.

Q11.	Inulin is made up of _______ and _______.
	A.glucose and fructose
	B.glucose and fructose
	C.fructose and mannose
	D.mannose and glucose

Ans: glucose and fructose
Explanation:
Inulin is a polysaccharide made up of glucose and fructose.

Q12.	The structure shown above is
	A.mannose
	B.fructose
	C.glucose
	D.galactose

Ans: glucose
Explanation:
MCQ Questions for Class 11 Biology Chapter 9 Biomolecules with Answers 2

Glucose molecule

Q13.	A protein having both structural and enzymatic traits is
	A.Collagen
	B.Trypsin
	C.Myosin
	D.Actin

Ans: Myosin

Q14.	NADP contains vitamin ______.
	A.B1
	B.B2
	C.B3
	D.B12

Ans: B3
Explanation:
B3 also named as niacin.

Q15.	With reference to enzymes, which one of the following statements is true?
	A.Apoenzyme = Holoenzyme + Coenzyme
	B.Holoenzyme = Apoenzyme + Coenzyme
	C.Coenzyme = Apoenzyme + Holoenzyme
	D.Holoenzyme = Coenzyme – Apoenzyme

Ans: Holoenzyme = Apoenzyme + Coenzyme

Q16.	Inhibitor binds to the active site of the enzyme. Hence blocking the reaction. This is an example of
	A.allosteric inhibition
	B.feedback inhibition
	C.uncompetitive inhibition
	D.competitive inhibition

Ans: 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.

Q17.	The fastest enzyme known is
	A.DNA polymerase
	B.carbonic anhydrase
	C.carbonic dehydrogenase
	D.DNA ligase

Ans: carbonic anhydrase
Explanation:
The fastest enzyme known is carbonic anhydrase. It converts 10⁶ molecules of carbon dioxide molecules per second.

Q18.	Lecithin is a
	A.polysaccharide
	B.protein
	C.nucleic acid
	D.lipid

Ans: liquid
Explanation:
Lecithin is a phospholipid.

Q19.	The minimum amount of energy required to initiate a chemical reaction is called
	A.enzymatic energy
	B.activation energy
	C.substrate energy
	D.initiation energy

Ans: activation energy
Explanation:
The minimum amount of energy required to initiate a chemical reaction is called activation energy.

Q20.	Enzymes, vitamins and hormones are common in
	A.Enhancing oxidative metabolism
	B.Being synthesised in the body of organisms
	C.Being proteinaceous
	D.Regulating metabolism