Biochemistry in Biotechnology MCQs

Question 1

Match the high energy compounds in Group I with the biosynthetic pathways for the molecules in Group II. Group I Group II P. GTP 1. Fatty acid Q. UTP 2. Phospholipid R. CTP 3. Protein S. Acyl coenzyme A 4. Peptidoglycan

Accepted Answer

P-3, Q-4, R-2, S-1

Answer

P-3, Q-2, R-4, S-1

Answer

P-2, Q-4, R-3, S-1

Answer

P-4, Q-3, R-1, S-2

Question 2

If a plant is shifted to cold temperature, which of the following changes would take place in its membrane?

Accepted Answer

Ratio of unsaturated to saturated fatty acids would increase

Answer

Ratio of unsaturated to saturated fatty acids would decrease

Answer

Absolute amount of both fatty acids would increase keeping the ratio same

Answer

Absolute amount of both fatty acids would remain unchanged

Question 3

Match items in Group I with Group II. Group I Group II P. Glycolytic pathway 1. Chloroplast Q. Eukaryotic oxidative metabolism 2. Glyoxysomes R. Glyoxylate cycle 3. Mitochondria S. Calvin cycle 4. Cytosol

Accepted Answer

P-4, Q-3, R-2, S-1

Answer

P-1, Q-2, R-3, S-4

Answer

P-2, Q-3, R-4, S-1

Answer

P-3, Q-4, R-1, S-2

Question 4

The value of ΔG°, if given Kep is 1.7, at 23°C will be

Accepted Answer

-17.19 kJ mol-1

Answer

-19.8 kJ mol-1

Answer

+52.82 kJ mol-1

Answer

-117.07 kJ mol-1

Question 5

Oxidation reduction reactions with positive standard redox potential (ΔE°) have

Accepted Answer

Negative ΔG°

Answer

Positive ΔG°

Answer

Positive ΔE+

Answer

Negative ΔE+

Question 6

Identify the enzyme that catalyzes the following reaction. $$\alpha {	ext{ - Ketoglutarate}} + NADH + NH_4^ + + {H^ + } 	o {	ext{Glutamate}} + NA{D^ + } + {H_2}O$$

Accepted Answer

Glutamate dehydrogenase

Answer

Glutamate synthetase

Answer

Glutamate oxoglutarate aminotransferase

Answer

α-Ketoglutarate deaminase

Question 7

Match the following photoreceptors with their prosthetic groups and spectral specificity Photoreceptor Moiety that absorbs light Absorption (nm) P. Phototropin 1. Chromobilin a. 400 - 500 Q. Cryptochrome 2. FAD b. 600 - 800 R. Phytochrome 3. FMN c. 500 - 600

Accepted Answer

P-3-a, Q-2-a, R-1-b

Answer

P-1-b, Q-1-a, R-3-b

Answer

P-3-a, Q-1-a, R-1-c

Answer

P-2-c, Q-1-c, R-1-a

Question 8

The degree of inhibition for an enzyme catalyzed reaction at a particular inhibitor concentration is independent of initial substrate concentration. The inhibition follows

Accepted Answer

Non-competitive inhibition

Answer

Competitive inhibition

Answer

Mixed inhibition

Answer

Uncompetitive inhibition

Question 9

Which one of the following amino acid residues will destabilize an α-helix when inserted in the middle of the helix?

Accepted Answer

Pro

Answer

Val

Answer

Ile

Answer

Leu