Biochemistry in Biotechnology MCQs

Question 1

Determine the correctness or otherwise of the following Assertion (A) and Reason (R). Assertion: Plants convert fatty acids into glucose. Reason: Plants have peroxisomes.

Accepted Answer

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

Answer

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

Answer

(A) is true but (R) is false

Answer

(A) is false but (R) is true

Question 2

The turnover numbers for the enzymes E1 and E2 are 150 s-1 and 15 s-1 respectively. This means

Accepted Answer

The velocity of E1 catalyzed reaction is always greater than that of E2

Answer

E1 binds to its substrate with higher affinity than E2

Answer

The velocity of reactions catalyzed by E1 and E2 at their respective saturating substrate concentrations could be equal, if concentration of E2 used is 10 times that of E1

Answer

The velocity of E1 catalyzed reaction at a particular enzyme concentration and saturating substrate concentration is lower than that of E2 catalyzed reaction under the same conditions

Question 3

Match the chemicals in Group I with the possible type/class in Group II. Group I Group II P. Picloram 1. Vitamin Q. Zeatin 2. Auxin R. Thiamine 3. Amino Acid S. Glutamine 4. Cytokinin

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 4

A protein without its prosthetic group is known as

Accepted Answer

Apoprotein

Answer

Hemoprotein

Answer

Holoprotein

Answer

lipoprotein

Question 5

The active site in the alpha/beta barrel structures is usually located

Accepted Answer

At the carboxy side of the strands

Answer

Inside the barrel

Answer

At the amino side of the strands

Answer

At any arbitrary site

Question 6

Identify the statement that is not applicable to an enzyme catalyzed reaction.

Accepted Answer

Enzymes do not accelerate the rate of reverse reaction

Answer

Enzyme catalysis involves propinquity effects

Answer

The binding of substrate to the active site causes a strain in the substrate

Answer

Enzyme catalysis involves acid-base chemistry

Question 7

Amino acid residue which is most likely to be found in the interior of water-soluble globular proteins is

Accepted Answer

Valine

Answer

Threonine

Answer

Aspartic acid

Answer

Histidine

Question 8

In N-linked glycosylation, the oligosaccharide chain is attached to protein by

Accepted Answer

Asparagine

Answer

Arginine

Answer

Serine

Answer

Threonine

Question 9

Which of the following components constitute a molecular mechanics force field? P. Bond stretching Q. Bond angle bending R. Torsional bond rotation S. Non-bonded interactions

Accepted Answer

P, Q, R and S

Answer

P and Q only

Answer

P, Q and R only

Answer

P, Q and S only