Molecular Basis Of Inheritance
AIIMS 2003
Q1
Errorless
Critical Thinking
Numerical
Which one of the following correctly represents the manner of replication of DNA
Correct Answer: D
Explanation:
The new strands of DNA are formed in the $5'\rightarrow3'$ direction from the $3'\rightarrow5'$ template DNA by the addition of deoxyribonucleotides to the $3'$ end of primer RNA.
CBSE PMT 1990
Q2
Errorless
Gene regulation and Genetic code
Numerical
There are 64 types of codons in genetic code dictionary because
(a) There are 64 types of tRNA's found in cell
Correct Answer: D
Explanation:
Genetic code is triplet and in each triplet code three bases are present $(4^{3})$ .
Q3
Errorless
Nucleic acid (DNA/RNA)
Numerical
The adjoining figure given below shows DNA (image)

Which of the following figure shows two nucleotides correctly joined together
(a)
(b)
(c)
(d)

Which of the following figure shows two nucleotides correctly joined together
(a)
(b)
(c)
(d)
Correct Answer: B
Explanation:
B
Q4
Errorless
Nucleic acid (DNA/RNA)
Numerical
A cell is grown in a solution which contain radioactive nucleotides, so that its DNA is labelled with radioactivity. It is isolated from the radioactive solution and grown in a normal medium, so that any new DNA strands it makes will not be radioactive. The cell replicates its DNA and divides in the normal medium. The two daughter cells also replicate their DNA and divide, producing a total of four cells. If a dotted line represents a radioactive DNA strand and a solid line represents a nonradioactive DNA strand, which of the following depicts the DNA of the four cells [NCERT] image
(a)
(b)
(c)
(d)
(a)
(b)
(c)
(d)
Correct Answer: D
Explanation:
D