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Free Download as PDF of the detailed solutions for class 12 Biology from NCERT or CBSE text book as per exam pattern, to help you in day to day learning. We provide all important questions and answers from chapter Molecular Basis of Inheritance of Biology.
31
Who discovered the process transformation?
[1]
Colin
[2]
Maurice
[3]
Hershey
[4]
Frederich Griffith
Answer: Frederich Griffith
32
Chargaff’s rule were formulated in
[1]
1904
[2]
1944
[3]
1954
[4]
1949
33
Possible number of triplets as genetic code:
[1]
4
[2]
16
[3]
24
[4]
64
34
The distance between two adjacent nucleotide base pairs is
[1]
2 nm
[2]
3.4 A
[3]
20 A0
[4]
3.4nm
35
RNA molecules that act as enzymes are called ribozymes.
[1]
Polymerase
[2]
Ribozymes
[3]
Transcriptase
[4]
Both (1) and (2)
36
Degeneracy of genetic code is due to
[1]
functional 64 codons and 20 amino acids
[2]
functional 61 codons and 20 amino acids
[3]
functional 20 codons and 61 amino acids
[4]
functional 20 codons and 20 amino acids
Answer: functional 61 codons and 20 amino acids
37
According to the lac-operon concept, which functional unit of the bacterial gene material is responsible for suppressing the activity of the operator gene in the absence of lactose?
[1]
Promoter gene
[2]
Repressor protein
[3]
Regulator gene
[4]
Structural gene
38
During translation initiation in prokaryotes, a GTP molecule is needed in
[1]
association of 30S, mRNA with formyl-met-t RNA
[2]
association of 50S subunit of ribosome with initiation complex
[3]
formation of formyl-met-tRNA
[4]
binding of 30 subunit of ribosome with mRNA
Answer: association of 30S, mRNA with formyl-met-t RNA
39
The Segments of DNA, capable of moving from one location to another are
[1]
Introns
[2]
Transposons
[3]
Exons
[4]
Operons
40
Which one belongs to DNA?
[1]
ATUG
[2]
ACTG
[3]
AUGT
[4]
AGUT
41
Individuals affected with alkaptonuria can be detected by the colour of urine. This is because of
[1]
Oxidation of tyrosine
[2]
Oxidation of phenyl alanine
[3]
Oxidation of homogenetisic acid
[4]
Reduction of homogenetisic acid
Answer: Oxidation of homogenetisic acid
42
In Blender experiment, it we use radioactive sulphur, radio activity is seen in
[1]
in the pellet
[2]
in the protein part
[3]
in the DNA
[4]
None of these
Answer: in the protein part
43
Semi conservative DNA replication was first demonstrated by
[1]
Meselson
[2]
Taylor
[3]
Avery
[4]
Stahl
44
Enzymes called ______ add complementary nucleotides, floating inside the nucleus.
[1]
DNA polymerase
[2]
DNA synthetase
[3]
Lipoprotein lipase
[4]
None of these
45
Whose experiments cracked the DNA and discovered unequivocally that a genetic code is a ‘‘triplet’’?
[1]
Beadle and Tatum
[2]
Nirenberg and Matthaei
[3]
Hershey and Chase
[4]
Morgan and Sturtevant
Answer: Nirenberg and Matthaei
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