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

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Questions
46 The enzyme which can initiate the synthesis of DNA
1 primase
2 helicase
3 ligase
4 DNA polymerase

Answer: primase
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
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48 Translation refers to the process of polymerisation of amino acids to form _______.
1 Backbone
2 Ribosome
3 Polypeptide
4 Single codon

Answer: Polypeptide
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

Answer: Gene
53 Which of the followings are cancer-causing genes?
1 Carcinogens
2 Mutagens
3 Metastases
4 Oncogenes

Answer: Oncogenes
54 In history of biology, human genome project led to the development of?
1 Bioinformatics
2 Biosystematics
3 Biotechnology
4 Biomonitoring

Answer: Bioinformatics
55 During replication of DNA,Okazakifragments are formed in the direction of :
1 3′→5
2 5′→5′
3 3′→3′
4 5′→3′

Answer: 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

Answer: RNA polymerase
59 Okazaki is known for his contribution to the understanding of
1 Transcription
2 Translation
3 DNA replication
4 Mutation

Answer: DNA replication
60 ______ occurs in RNA instead of the nitrogenous base thymine found in DNA.
1 Uracil
2 Cytosine
3 Guanine
4 Ribose

Answer: Uracil

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