NCERT Class 12 Biology: Chapter –6 Molecular Basis of Inheritance Part 3
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Question 19:
Which of the following are the functions of RNA?
a. It is a carrier of genetic information from DNA to ribosomes synthesising polypeptides.
b. It carries amino acids to ribosomes.
c. It is a constituent component of ribosomes.
d. All of the above.
Answer: (d)
Question 20:
While analysing the DNA of an organism a total number of 5386 nucleotides were found out of which the proportion of different bases were: Adenine Guanine , Cytosine , Thymine . Considering the Chargaff’s rule it can be concluded that: a. it is a double stranded circular DNA
b. It is single stranded DNA
c. It is a double stranded linear DNA
d. No conclusion can be drawn
Answer: (b)
Question 21:
In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called:
a. A-DNA
b. B-DNA
c. c DNA
d. r DNA
Answer: (c)
Question 22:
If Meselson and Stahl’s experiment is continued for four generations in bacteria, the ratio of containing DNA in the fourth generation would be:
a. 1:1:0
b. 1:4:0
c. 0:1:3
d. 0:1:7
Answer: (d)
Question 23:
If the sequence of nitrogen bases of the coding strand of DNA in a transcription unit is:
, the sequence of bases in its RNA transcript would be;
a.
b.
c.
d.
Answer: (a)
Question 24:
The RNA polymerase holoenzyme transcribes:
a. the promoter, structural gene and the terminator region
b. the promoter, and the
c. the structural gene and the terminator regions
d. the structural gene only.
Answer: (c)
Question 25:
If the base sequence of a codon in , the sequence of pairing with it must be:
a.
b.
c.
d.
Answer: (b)
Question 26:
The amino acid attaches to the at its:
a.
b.
c.
d. DHU loop
Answer: (b)
Question 27:
To initiate translation, the mRNA first binds to:
a. The smaller ribosomal sub-unit,
b. The larger ribosomal sub-unit
c. The whole ribosome
d. No such specificity exists.
Answer: (a)