Biochemistry in Biotechnology MCQ Questions & Answers

1.
Which one of the following is INCORRECT about protein structures?

A. A protein fold is stabilized by favorable noncovalent interactions

B. All parts of a fold can be classified as helices, strands or turns

C. Two non-covalent atoms cannot be closer than the sum of their van der Waals radii

D. The peptide bond is nearly planar

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2.
Which one of the following amino acids has three ionizable groups?

A. Glycine

B. Leucine

C. Valine

D. Lysine

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3.
During lactic acid fermentation, net yield of ATP and NADH per mole of glucose is

A. 2 ATP and 2 NADH

B. 2 ATP and 0 NADH

C. 4 ATP and 2 NADH

D. 4 ATP and 0 NADH

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4.
The reactions leading to the formation of amino acids from the TCA cycle intermediates are

A. Carboxylation

B. Isomerization

C. Transamination

D. Decarboxylation

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5.
The catalytic efficiency for an enzyme is defined as

A. $${K_{cat}}$$

B. $$\frac{{{V_{\max }}}}{{{k_{cat}}}}$$

C. $$\frac{{{k_{cat}}}}{{{K_M}}}$$

D. $$\frac{{{K_{cat}}}}{{{v_{\max }}}}$$

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6.
Which of the following types of molecules act as biological catalysts?
P. Protein
Q. RNA
R. Phospholipid

A. P and Q only

B. P and R only

C. Q and R only

D. P, Q and R

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7.
Which one of the following amino acids has the highest probability to be found on the surface of a typical globular protein in aqueous environment?

A. Ala

B. Val

C. Arg

D. Ile

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8.
Determine the correctness or otherwise of the following Assertion (A) and the Reason (R).
Assertion: A very low amount of inhibitor can act as an activator for allosteric enzymes.
Reason: Allosteric enzymes follow Michaelis-Menten kinetics.

A. Both (A) and (R) are true and (R) is the correct reason for (A)

B. Both (A) and (R) are true but (R) is not the correct reason for (A)

C. (A) is true but (R) is false

D. (A) is false but (R) is true

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9.
During photorespiration under low CO₂ and high O₂ levels, O₂ reacts with ribulose 1, 5-bisphosphate to yield

A. One molecule each of 3-phosphoglycerate and 2-phosphoglycolate

B. Two molecules of 3-phosphoglycerate

C. Two molecules of 2-phosphoglycolate

D. One molecule each of 3-phosphoglycerate and glyoxylate

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10.
The activity of an enzyme is expressed in International Units (IU). However, the SI unit for enzyme activity is Katal. One Katal is

A. 1.66 × 10⁴ IU

B. 60 IU

C. 6 × 10⁷ IU

D. 10⁶ IU

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Biochemistry in Biotechnology MCQ Questions & Answers | Biotechnology

1. Which one of the following is INCORRECT about protein structures?

Answer & Solution

2. Which one of the following amino acids has three ionizable groups?

Answer & Solution

3. During lactic acid fermentation, net yield of ATP and NADH per mole of glucose is

Answer & Solution

4. The reactions leading to the formation of amino acids from the TCA cycle intermediates are

Answer & Solution

5. The catalytic efficiency for an enzyme is defined as

Answer & Solution

6. Which of the following types of molecules act as biological catalysts? P. Protein Q. RNA R. Phospholipid

Answer & Solution

7. Which one of the following amino acids has the highest probability to be found on the surface of a typical globular protein in aqueous environment?

Answer & Solution

8. Determine the correctness or otherwise of the following Assertion (A) and the Reason (R). Assertion: A very low amount of inhibitor can act as an activator for allosteric enzymes. Reason: Allosteric enzymes follow Michaelis-Menten kinetics.

Answer & Solution

9. During photorespiration under low CO2 and high O2 levels, O2 reacts with ribulose 1, 5-bisphosphate to yield

Answer & Solution

10. The activity of an enzyme is expressed in International Units (IU). However, the SI unit for enzyme activity is Katal. One Katal is

Answer & Solution

1.
Which one of the following is INCORRECT about protein structures?

2.
Which one of the following amino acids has three ionizable groups?

3.
During lactic acid fermentation, net yield of ATP and NADH per mole of glucose is

4.
The reactions leading to the formation of amino acids from the TCA cycle intermediates are

5.
The catalytic efficiency for an enzyme is defined as

6.
Which of the following types of molecules act as biological catalysts?
P. Protein
Q. RNA
R. Phospholipid

7.
Which one of the following amino acids has the highest probability to be found on the surface of a typical globular protein in aqueous environment?

8.
Determine the correctness or otherwise of the following Assertion (A) and the Reason (R).
Assertion: A very low amount of inhibitor can act as an activator for allosteric enzymes.
Reason: Allosteric enzymes follow Michaelis-Menten kinetics.

9.
During photorespiration under low CO₂ and high O₂ levels, O₂ reacts with ribulose 1, 5-bisphosphate to yield

10.
The activity of an enzyme is expressed in International Units (IU). However, the SI unit for enzyme activity is Katal. One Katal is