NCERT - Molecular Basis of Inheritance Questions and Answers of Class 12 Biology | Biology - Molecular Basis of Inheritance MCQs | NCERT Solution of Class 12 Biology Molecular Basis of Inheritance | NCERT Multiple Choice Questions and Answers of Biology from Chapter Molecular Basis of Inheritance

(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

(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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