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NCERT - Molecular Basis of Inheritance Questions and Answers of Class 12 Biology | GkSeries

Questions
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

Answer: 1949
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33 Possible number of triplets as genetic code:
1 4
2 16
3 24
4 64

Answer: 64
34 The distance between two adjacent nucleotide base pairs is
1 2 nm
2 3.4 A
3 20 A0
4 3.4nm

Answer: 3.4 A
35 RNA molecules that act as enzymes are called ribozymes.
1 Polymerase
2 Ribozymes
3 Transcriptase
4 Both (1) and (2)

Answer: Ribozymes
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

Answer: Regulator 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

Answer: Transposons
40 Which one belongs to DNA?
1 ATUG
2 ACTG
3 AUGT
4 AGUT

Answer: ACTG
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

Answer: Taylor
44 Enzymes called ______ add complementary nucleotides, floating inside the nucleus.
1 DNA polymerase
2 DNA synthetase
3 Lipoprotein lipase
4 None of these

Answer: DNA polymerase
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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