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

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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.
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(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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