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

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Questions
1 All the terminator codons begin with the nucleotide of
1 Adenine
2 Uracil
3 Guanine
4 Cytosine

Answer: Uracil
2 Where is ribosomal RNA synthesized?
1 Ribosome
2 Mitochondrion
3 Vacuole
4 Nucleolus

Answer: Nucleolus
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3 During transcription, RNA polymerase holoenzyme binds to a gene promoter and assumes a saddle-like structure. What is its DNA-binding sequence?
1 TATA
2 AATT
3 CACC
4 TTAA

Answer: TATA
4 Mitochondria are semi autonomous as they possess
1 DNA
2 DNA + RNA
3 DNA + RNA Ribosomes
4 Protein

Answer: DNA + RNA Ribosomes
5 DNA is a polymer made of ______.
1 Amino acids
2 Fats
3 Sugars
4 Nucleotides

Answer: Nucleotides
6 DNA is made of two chains that twist about one another in the shape of a _______.
1 Broken ladder
2 Straight ladder
3 Straight spiral
4 Double helix

Answer: Double helix
7 In the synthesis of which of the following, the DNA molecule is not directly involved?
1 mRNA molecule
2 another DNA molecule
3 tRNA molecule
4 protein molecule

Answer: protein molecule
8 Removal of RNA polymerase III from nucleoplasm will affect the synthesis of
1 mRNA
2 rRNA
3 tRNA
4 hnRNA

Answer: tRNA
9 Which of the following is structural subunit of DNA?
1 Protein
2 Carbohydrate
3 RNA
4 Nucleotides

Answer: Nucleotides
10 The site of translation (protein synthesis) is ______.
1 Mitochondria
2 Ribosomes
3 Nucleus
4 None of these

Answer: Ribosomes
11 What does "lac" refer to in what we call the lac operon?
1 Lactose
2 Lactase
3 Lac insect
4 The number 1,00,000

Answer: Lactose
12 Removal of introns and joining of exons in a defined order during transcription is called
1 Slicing
2 Looping
3 Inducing
4 Splicing

Answer: Splicing
13 During transcription, if the nucleotide sequence of the DNA strand that is being coded is ATACG, then the nucleotide sequence in the mRNA would be
1 TCTGG
2 UAUGC
3 UATGC
4 TATGC

Answer: UAUGC
14 RNA has the sugar ______, instead of deoxyribose.
1 Fructose
2 Ribose
3 Sucrose
4 Deoxyribose

Answer: Ribose
15 HIV is classified as a retrovirus because its genetic information is carried in
1 DNA instead of RNA
2 DNA
3 RNA instead of DNA
4 Protein coat

Answer: RNA instead of DNA

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