Free Molecular Basis Of Inheritance (Weekly Quiz: 4) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Question-1

Identify the labels A, B, C and D in the given structure of tRNA and select the correct option.

	A	B	C	D
(a)	Anticodon loop	T Ψ C loop	AA binding site	DHU loop
(b)	AA binding site	T Ψ C loop	Anticodon loop	DHU loop
(c)	AA binding site	DHU loop	Anticodon loop	T Ψ C loop
(d)	AA binding site	DHU loop	T Ψ C loop	Anticodon loop

(a) (a)

(b) (b)

(c) (c)

(d) (d)

Question-2

Find out the wrong sentence about heterochromatin.

(a) It is transcriptionally active

(b) It stains dark

(c) It is densely packed

(d) It is late replicating

Question-3

Removal of introns and joining the exons in a defined order in a transcription unit is called

(a) Capping

(b) Transformation

(c) Splicing

(d) Tailing

Question-4

What is indicated by 'b' in the figure?

(a) Hybrid

(b) Heavy

(c) Light

(d) Heavy hybrid

Question-5

Which of the following mRNA can be transcripted?

(a) UAA.UAV.UGG

(b) AUG.UGA.UUU

(c) UAG.UGA.UUV

(d) UGA.UUV.UGG

Question-6

In splicing, the sequences which are kept and those which are removed, respectively, are

(a) introns and exons

(b) exons and introns

(c) exons and cistrons

(d) introns and cistrons

Question-7

Genes that are involved in turning on or off the transcription of a set of structural genes are called

(a) Regulator genes

(b) Redundant genes

(c) Operator genes

(d) Polymorphic genes

Question-8

The transforming principle of Pneumococcus as found out by Avery, MacLeod and McCarty was

(a) DNA

(b) mRNA

(c) protein

(d) polysaccharide

Question-9

Assertion:
DNA replication occurs within a small opening of the DNA helix.
Reason:
DNA cannot be separated in its entire length due to very high energy requirement.

(a) If both the assertion and reason are true but the reason is not a correct explanation of the assertion.

(b) If both the assertion and the reason are true and the reason is a correct explanation of the assertion.

(c) If the assertion is true but the reason is false.

(d) If both the assertion and reason are false.

Question-10

E.coli cells with a mutated z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because

(a) they cannot synthesise functional beta galactosidase

(b) the lac operon is constitutively active in these cells

(c) in the presence of glucose, E.coli cells do not utilise lactose

(d) they cannot transport lactose from the medium into the cell