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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.
46
The enzyme which can initiate the synthesis of DNA
[1]
primase
[2]
helicase
[3]
ligase
[4]
DNA polymerase
47
The enzyme used in reverse transcription is
[1]
Primase
[2]
Reverse transcriptase
[3]
RNA dependent DNA polymerase
[4]
DNA dependent RNA polymerase
Answer: RNA dependent DNA polymerase
48
Translation refers to the process of polymerisation of amino acids to form _______.
[1]
Backbone
[2]
Ribosome
[3]
Polypeptide
[4]
Single codon
49
In a DNA strand the nucleotides are held together by:
[1]
Peptide bonds
[2]
Glycosidic bonds
[3]
Hydrogen bonds
[4]
Phosphodiester bonds
Answer: Phosphodiester bonds
50
In a DNA strand the nucleotides are held together by:
[1]
Glycosidic bonds
[2]
Hydrogen bonds
[3]
Peptide bonds
[4]
Phosphodiester bonds
Answer: Phosphodiester bonds
51
Why are UGA, UAG and UAA called termination codons?
[1]
They do not specify any amino acid
[2]
They are present at the beginning of mRNA
[3]
They terminate anticodons
[4]
They indicate initiation of translation
Answer: They do not specify any amino acid
52
The segment of DNA which acts as the instrumental manual for the synthesis of the protein is
[1]
Nucleoside
[2]
Nucleotide
[3]
Ribose
[4]
Gene
53
Which of the followings are cancer-causing genes?
[1]
Carcinogens
[2]
Mutagens
[3]
Metastases
[4]
Oncogenes
54
In history of biology, human genome project led to the development of?
[1]
Bioinformatics
[2]
Biosystematics
[3]
Biotechnology
[4]
Biomonitoring
55
During replication of DNA,Okazakifragments are formed in the direction of :
[1]
3′→5
[2]
5′→5′
[3]
3′→3′
[4]
5′→3′
56
Molecular basis of organ differentiation depends on the modulation in transcription by
[1]
Anticodon
[2]
RNA polymerase
[3]
Ribosome
[4]
Transcription factor
Answer: Transcription factor
57
The reaction, Amino acid + ATP → Aminoacyl-AMP + P–P depicts
[1]
Amino acid assimilation
[2]
Amino acid transformation
[3]
Amino acid activation
[4]
Amino acid translocation
Answer: Amino acid activation
58
______ catalyzes the formation of RNA on a DNA template and capable of binding to a promoter.
[1]
DNA polymerase
[2]
Helicase
[3]
DNA lipase
[4]
RNA polymerase
59
Okazaki is known for his contribution to the understanding of
[1]
Transcription
[2]
Translation
[3]
DNA replication
[4]
Mutation
60
______ occurs in RNA instead of the nitrogenous base thymine found in DNA.
[1]
Uracil
[2]
Cytosine
[3]
Guanine
[4]
Ribose
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