NCERT – MCQs on Molecular Basis of Inheritance of Class 12 Biology

Questions

76 If the total amount of adenine and thymine in a double-stranded DNA is 45%, the amount of guanine in this DNA will be

1 22.5%

2 27.5%

3 45%

4 55%

View Answer

Answer: 27.5%

77 Number of nitrogenous bases in a Codon is

1 3

2 2

3 1

4 5

View Answer

Answer: 3

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78 DNA has equal number of adenine and thymine residues (A = T) and equal number of guanine and cytosine (G = C). These relationships are known as

1 Chargaff's rule

2 Coulomb's law

3 Le-Chatelier's principle

4 Van't Hoff plot

View Answer

Answer: Chargaff's rule

79 RNA polymerase is only capable of catalyzing the process of ______.

1 Termination

2 Initiation

3 Elongation

4 All of the above

View Answer

Answer: Elongation

80 E. coli cells with a mutated z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because

1 They cannot synthesize functional beta galactosidase

2 They cannot transport lactose from the medium into the cell

3 The lac operon is constitutively active in these cells

4 In the presence of glucose, E. coli cells do not utilize lactose

View Answer

Answer: They cannot synthesize functional beta galactosidase

81 Beadle and Tatum showed that each kind of mutant bread mould they studied lacked a specific enzyme. Their experiments demonstrated that

1 Cells need specific enzymes in order to function

2 Genes are made of DNA

3 Enzymes are required to repair damage

4 Genes carry information for making proteins

View Answer

Answer: Genes carry information for making proteins

82 Molecular scissors which cut DNA at specific site is

1 Pectinase

2 Polymerase

3 Restriction endonuclease

4 Ligase

View Answer

Answer: Restriction endonuclease

83 A gene of operon which synthesizes a repressor protein is ______.

1 Promoter gene

2 Operator gene

3 Structural gene

4 Regulator gene

View Answer

Answer: Regulator gene

84 Central dogma of protein synthesis is

1 DNA → RNA → Protein

2 DNA → DNA → Protein

3 RNA → DNA → Protein

4 DNA → protein → RNA

View Answer

Answer: DNA → RNA → Protein

85 WThe region of tRNA which consists of three bases complementary to a mRNA codon is ______.

1 Codon

2 Intron

3 Anticodon

4 Interferon

View Answer

Answer: Anticodon

86 Balbiani rings are the sites of

1 DNA replication

2 RNA and protein synthesis

3 Synthesis of lipids

4 Synthesis of polysaccharides

View Answer

Answer: RNA and protein synthesis

87 Production of a human protein in bacteria by genetic engineering is possible because

1 Bacterial cell can carry out the RNA splicing reactions

2 The mechanism of gene regulation is identical in humans and bacteria

3 The human chromosome can replicate in bacterial cell

4 The genetic code is universal

View Answer

Answer: The genetic code is universal

88 The genetic material of Rabies virus is

1 Double stranded RNA

2 Single stranded RNA

3 Double stranded DNA

4 ssDNA

View Answer

Answer: Single stranded RNA

89 There are 64 codons in the genetic dictionary as

1 There are 64 amino acids to be coded

2 Genetic code has a triplet nature

3 There are 3 nonsense codons and 61 sense codons

4 There are 64 different types of t-RNA

View Answer

Answer: Genetic code has a triplet nature

90 DNA sequence that code for protein are known as

1 Introns

2 Exons

3 Control regions

4 Intervening sequences

View Answer

Answer: Exons

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