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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.
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%
77
Number of nitrogenous bases in a Codon is
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
79
RNA polymerase is only capable of catalyzing the process of ______.
[1]
Termination
[2]
Initiation
[3]
Elongation
[4]
All of the above
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
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
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
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
84
Central dogma of protein synthesis is
[1]
DNA → RNA → Protein
[2]
DNA → DNA → Protein
[3]
RNA → DNA → Protein
[4]
DNA → protein → RNA
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
86
Balbiani rings are the sites of
[1]
DNA replication
[2]
RNA and protein synthesis
[3]
Synthesis of lipids
[4]
Synthesis of polysaccharides
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
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
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
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
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