JOIN ADRE 2.0 Telegram Group

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

Questions
106 The RNA polymerase holoenzyme transcribes:
1 the promoter, structural gene and the terminator region
2 the promoter, and the
3 the structural gene and the terminator regions
4 the structural gene only.

Answer: the structural gene and the terminator regions
107 To initiate translation, the mRNA first binds to:
1 The smaller ribosomal sub-unit
2 The larger ribosomal sub-unit
3 The whole ribosome
4 No such specificity exists.

Answer: The smaller ribosomal sub-unit
Advertisement
Article and Schedule Quiz Start Test!

DOWNLOAD CURRENT AFFAIRS PDF FROM APP

108 Repressor proteins are coded for by ______ genes.
1 Structural
2 Operator
3 Promoter
4 Regulator

Answer: Regulator
109 The organelles in the cell where protein synthesis occurs are ______.
1 Endoplasmic reticulum
2 lNuceus
3 Ribosomes
4 mRNA

Answer: Ribosomes
110 PCR and Restriction Fragment Length Polymorphism are the methods fo
1 DNA sequencing
2 Genetic fingerprinting
3 Study of enzymes
4 Genetic transformation

Answer: Genetic fingerprinting
111 What is antisense technology?
1 RNA polymerase producing DNA
2 A cell displaying a foreign antigen used for synthesis of antigens
3 Production of somaclonal variants in tissue cultures
4 When a piece of RNA that is complementary in sequence is used to stop expression of a specific gene

Answer: When a piece of RNA that is complementary in sequence is used to stop expression of a specific gene
112 A DNA segment which serves as a kind of “on-off switch” for transcription is a/an ______.
1 Regulator gene
2 Structural gene
3 Promoter
4 Operator

Answer: Operator
113 Which one of the following does not follow the central dogma of molecular biology?
1 Pea
2 Mucor
3 HIV
4 Chlamydomonas

Answer: HIV
114 In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called
1 A-DNA
2 B-DNA
3 c DNA
4 r DNA

Answer: c DNA
115 Discontinuous synthesis of DNA occurs in one strand, because:
1 DNA molecule being synthesised is very long
2 DNA dependent DNA polymearse catalyses polymerisation only in one direction (5’ → 3’)
3 it is a more efficient process
4 DNA ligase has to have a role

Answer: DNA dependent DNA polymearse catalyses polymerisation only in one direction (5’ → 3’)
116 Both deoxyribose and ribose belong to a class of sugars called:
1 trioses
2 hexoses
3 pentoses
4 polysaccharides

Answer: pentoses
117 Which of the following statements is the most appropriate for sickle cell anaemia?
1 It cannot be treated with iron supplements
2 It is a molecular disease
3 It confers resistance to acquiring malaria
4 All of the above

Answer: All of the above
118 Who amongst the following scientists had no contribution in the development of the double helix model for the structure of DNA?
1 Rosalind Franklin
2 Maurice Wilkins
3 Erwin Chargaff
4 Meselson and Stahl

Answer: Meselson and Stahl
119 Which of the following steps in transcription is catalysed by RNA polymerse?
1 Initiation
2 Elongation
3 Termination
4 All of the above

Answer: Elongation
120 While analysing the DNA of an organism a total number of 5386 nucleotides were found out of which the proportion of different bases were: Adenine = 29%, Guanine= 17%, Cytosine = 32%, Thymine = 17%. Considering the Chargaff’s rule it can be concluded that:
1 it is a double stranded circular DNA
2 It is single stranded DNA
3 It is a double stranded linear DNA
4 No conclusion can be drawn

Answer: No conclusion can be drawn

ADRE 2.0 FULL LENGTH MOCK TEST

Take Mock Tests

Missiles Mock Test Start Test!
SSC MTS Mock Test Start Test
IBPS CLERK MOCK TEST Start Test
SSC MTS 2022 JULY 26 Shift 1 (ENGLISH) Start Test!
SSC GD Previous Year Paper 2021 Nov 17 Shift - I (Hindi) Start Test!
SSC CGL Tier - 1 PYP 2022 April 21 Shift- 1 (ENGLISH) Start Test!
MPSC PAPER I MOCK TEST 1 (ENGLISH) Start Test!
IB Security Assistant Mock test 1 (english) Start Test!
UP POLICE CONSTABLE MOCK TEST 1 Start Test!
DELHI POLICE CONSTABLE MOCK TEST 1 (HINDI) Start Test!

Chapters

Advertisement