General physiology Qs

 General physiology Qs

1. What is the soil concentration of Naked Extracellular [eDNA] in the environment?

A) 2 µg/g

B) 28µg/g

C) 50µg/g

D) 88µg/g

Ans: A

2. What is the concentration of Naked Extracellular [eDNA] in the aquatic environment?

A)20µg/g

B) 30µg/g

C) 58µg/g

D) 88µg/g

Ans: D

3. e-DNA may be involved in

A) Vertical gene transfer

B) Horizontal Gene transfer

C) Junk DNA process

D) Maintaining stability of its structure

Ans: B

Explanation: Naked extracellular [e-DNA] is released by cell death and constantly existing in the environment. The concentration in the soil is 2µg/g and in Aquatic environment is 88µg/g.

The possible functions are:

a. May be involved in Horizontal gene transfer.

b.provide nutrition

c.act as a Buffer to recruit or titrate ions or antibiotics

d.act as an extracellular matrix component in the bio films.

[bio films-group of microbes in which cells adhere to each other.

4. The common form of DNA is said to be

A) Left handed

B) Right handed

C) Anti-clock wise direction

D) Parallel

Ans: B

Explanation: The 2 strands of each DNA molecules are anti-parallel, i.e. they run in opposite directions to each other. One chain runs in 5’ [5 prime] to 3’ [3prime] and the other in 3’ to 5’.The common form of DNA is said to be Right handed, because the base residue forms a spiral in clock-wise direction.

5. How many pairs of nucleotides are present in one full turn of helix in Watson&Crick –B-DNA?

A) 10

B) 20

C) 30

D) 40

Ans: A

6 .Z-DNA is-

A) Right handed

B) Left handed

C) Clock-wise

D) Common form

Ans: B

7. Which of the following statements regarding RNA is wrong?

A) Single strand

B) Contains Ribose sugar

C) Obeys Chargaff’s rule

D) Pyrimidine is uracil

Ans: C

8. JUNK-DNA is called

A) Essential DNA

B) e-DNA

C)Codons

D) Non-coding DNA

Ans: D

9. Each molecule of Calmodulin [CaM] binds

A) 6 calcium ions

B) 5 calcium ions

C) 4 calcium ions

D) 3 calcium ions

Ans: C

10. Which of the following substances is called ‘Docking protein’ /

A) Signal recognition particle [SRP-Receptor]

B) Signal peptidase

C) Nascent protein

D) Calmodulin

Ans: A