18110.A single strand of nucleic acid tagged with a radioactive molecule is called
Plasmid
Probe
Vector
Selectable marker
18111.In the synthesis of which of the following, the DNA molecule is not directly involved?
mRNA molecule
protein molecule
another DNA molecule
tRNA molecule
18112.What would happen if in a gene encoding a polypeptide of 50 amino acids, 25th codon (UAU) is mutated to UAA
A polypeptide of 24 amino acids will be formed
A polypeptide of 25 amino acids will be formed
A polypeptide of 49 amino acids will be formed
Two polypeptides of 24 and 25 amino acids will be formed
18113.If one strand of DNA has the nitrogenous base sequence as ATCTG, what would be the complementary RNA strand sequence?
AACTG
ATCGU
TTAGU
UAGAC
18114.Degeneracy of genetic code is due to
functional 61 codons and 20 amino acids
functional 64 codons and 20 amino acids
functional 20 codons and 20 amino acids
functional 20 codons and 61 amino acids
18115.Why are UGA, UAG and UAA called termination codons?
They do not specify any amino acid
They are present at the beginning of mRNA
They terminate anticodons
They indicate initiation of translation
18116.During replication of DNA,Okazakifragments are formed in the direction of :
3′ → 5′
5′ → 3′
5′ → 5′
3′ → 3′
18117.Link together two pieces of DNA
Link together two pieces of DNA
Cut DNA at specific locations
Restrict elongation of DNA
Restrict DNA replication
18119.The sequence of events mentioned below are symbolized by alphabets. Choose the correct answer where the alphabets are matched with the processes.
RNA —(A)—> DNA —(B)—> DNA —(C)—> mRNA —(D)—> Polypeptide
A = Replication, B = Transformation, C = Transcription, D = Translation
A = Reverse transcription, B = Translation, C = Transcription, D = Replication
A = Replication, B = Transcription, C = Translation, D = Transduction
A = Reverse transcription, B = Replication, C = Transcription, D = Translation