Cell Biology in Biotechnology MCQs

Question 1

At what stage mitosis occurs in bacteria?

Accepted Answer

None of the above

Answer

Vegetative phase

Answer

Reproductive phase

Answer

Both A and B

Question 2

In the cell cycle of a typical eukaryote, the sequence of events operating at the time of cell division is

Accepted Answer

S phase → G2 phase → M phase → G1 phase

Answer

S phase → G2 phase → G1 phase → M phase

Answer

S phase → M phase → G1 phase → G2 phase

Answer

S phase → G1 phase → M phase → G2 phase

Question 3

Match the proteins in Group I with cellular processes in Group II. List-I List-II P. p53 1. DNA packaging Q. Lysozyme 2. Apoptosis R. Tubulins 3. Hydrolysis of polysaccharides S. Histones 4. Chromosome segregation

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 4

A metacentric chromosomes will appear at anaphase as

Accepted Answer

Y-shaped

Answer

L- shaped

Answer

W-shaped

Answer

V-shaped

Question 5

Histone proteins are synthesized in

Accepted Answer

S-phase

Answer

M-phase

Answer

G1 phase

Answer

G2-phase

Question 6

Determine the correctness or otherwise of the following Assertion [A] and the Reason [R] regarding mammalian cells. Assertion [A]: Cells use Ca2+ and not Na+, for cell to-cell signaling. Reason [R]: In the cytosol, concentration of Na+ is lower than that of Ca2+

Accepted Answer

[A] is true but [R] is false

Answer

Both [A] and [R] are true and [R] is the correct reason for [A]

Answer

Both [A] and [R] are true but [R] is not the correct reason for [A]

Answer

Both [A] and [R] are false

Question 7

Smooth endoplasmic reticulum synthesizes

Accepted Answer

Steroids and lipids

Answer

Carbohydrates

Answer

Proteins

Answer

All the above

Question 8

DNA synthesis in eukaryotes occurs during which phase of the mitotic cell cycle?

Accepted Answer

S

Answer

M

Answer

G1

Answer

G0

Question 9

Which one of the following statements regarding G proteins is incorrect?

Accepted Answer

All G proteins are trimeric

Answer

GDP is bound to G protein in the resting stage

Answer

GTP bound α subunit cannot reassemble with by dimer

Answer

Activation of G protein may result in activation or inhibition of the target enzymes