Molecular Basis of Inheritance MCQs with answers

Dear candidates you will find MCQ questions of 12th Class - Biology | Chapter: Molecular Basis of Inheritance here. Learn these questions and prepare yourself for coming examinations. You can check the right answer of any question by clicking the option or by clicking view answer button.
All subjects and chapters of 12th Class are listed below. You can select any subject and chapter below to learn mcq questions of that chapter and subject.

Q. The DNA site where DNA-dependent RNA- polymerase binds for transcription, is called
  • (A) receptor
  • (B) regulator
  • (C) promotor
  • (D) operator
πŸ’¬ Discuss
βœ… Correct Answer: (C) promotor
Q. Operon model for regulation of transcription was proposed by
  • (A) Hershey and Chase
  • (B) Watson and Crick
  • (C) Jacob and Monod
  • (D) Meselson and Stahl
πŸ’¬ Discuss
βœ… Correct Answer: (C) Jacob and Monod
Q. Eukaryotic RNA polymerase III catalyses the synthesis of
  • (A) mRNA
  • (B) rRNA
  • (C) hnRNA
  • (D) tRNA
πŸ’¬ Discuss
βœ… Correct Answer: (D) tRNA
Q. The sequence of nitrogen bases in a # segment of a coding strand of DNA is ’ AATGCTTAGGCA. What will be the
sequence of nitrogen bases in the wRNA transcribed by it?
  • (A) UUA CGA AUC CGU
  • (B) AAU GCU AAC CGA
  • (C) AAU GCA AUC CGU
  • (D) AAU GCU UAG GCA
πŸ’¬ Discuss
βœ… Correct Answer: (D) AAU GCU UAG GCA
Q. In the lac operon of E.coli, the i gene codes for
  • (A) Ξ²-galactosidase
  • (B) lactase
  • (C) repressor
  • (D) inducer
πŸ’¬ Discuss
βœ… Correct Answer: (C) repressor
Q. Which of the following sets of codons contains only termination codons?
  • (A) UAA, UGA, UAG
  • (B) UUU, UCC, UGG
  • (C) UAA, UUU, UGG
  • (D) UAA, UAG, UAC
πŸ’¬ Discuss
βœ… Correct Answer: (A) UAA, UGA, UAG
Q. The central dogma of molecular biology (genetic information flow) was modified by the discovery of
  • (A) DNA polymerase
  • (B) Reverse transcriptase
  • (C) DNA ligase
  • (D) RNA polymerase
πŸ’¬ Discuss
βœ… Correct Answer: (B) Reverse transcriptase
Q. The promoter site and the terminator site for transcription are located at
  • (A) 3β€² (downstream) end and 5β€² (upstream) end, respectively of the transcription unit.
  • (B) 5β€² (upstream) end and 3β€² (downstream) end, respectively of the transcription unit.
  • (C) the 5β€² (upstream) end.
  • (D) the 3β€² (downstream) end.
πŸ’¬ Discuss
βœ… Correct Answer: (B) 5β€² (upstream) end and 3β€² (downstream) end, respectively of the transcription unit.
Q. The human chromosome with the highest and least number of genes in them are respectively
  • (A) Chromosome X and Y
  • (B) Chromosome 1 and Y
  • (C) Chromosome 1 and X
  • (D) Chromosome 21 and Y
πŸ’¬ Discuss
βœ… Correct Answer: (B) Chromosome 1 and Y
Q. Discontinuous synthesis of DNA occurs in one strand, because
  • (A) DNA ligase has to have a role.
  • (B) it is a more efficient process.
  • (C) DNA dependent DNA polymearse catalyses polymerisation only in one direction (5β€² β†’ 3β€²).
  • (D) DNA molecule being synthesised is very long.
πŸ’¬ Discuss
βœ… Correct Answer: (C) DNA dependent DNA polymearse catalyses polymerisation only in one direction (5β€² β†’ 3β€²).
Q. Which of the following are the functions of RNA?
  • (A) It is a carrier of genetic information from DNA to ribosomes synthesising polypeptides.
  • (B) It carries amino acids to ribosomes
  • (C) It is a constituent component of ribosomes
  • (D) All of the above.
πŸ’¬ Discuss
βœ… Correct Answer: (D) All of the above.
Q. In E.coli, the lac operon gets switched on when
  • (A) lactose is present and it binds to the Β», repressor.
  • (B) repressor binds to operator.
  • (C) RNA polymerase binds to the operator.
  • (D) lactose is present and it binds to RNA polymerase.
πŸ’¬ Discuss
βœ… Correct Answer: (A) lactose is present and it binds to the Β», repressor.
Q. The net electric charge on DNA and histone, is
  • (A) positive, negative
  • (B) negative, positive
  • (C) negative, negative
  • (D) positive, positive.
πŸ’¬ Discuss
βœ… Correct Answer: (B) negative, positive

12th Class mcqs download, 12th Class mcqs pdf free download, 12th Class free pdf download, 12th Class mcq questions, 12th Class ncert book pdf download,

Table of contents

  1. The DNA site where DNA-dependent RNA- polymerase binds for transcription, is called
  2. Operon model for regulation of transcription was proposed by
  3. Eukaryotic RNA polymerase III catalyses the synthesis of
  4. The sequence of nitrogen bases in a # segment of a coding strand of DNA is ’ AATGCTTAGGCA. What wi
  5. In the lac operon of E.coli, the i gene codes for
  6. Which of the following sets of codons contains only termination codons?
  7. The central dogma of molecular biology (genetic information flow) was modified by the discovery of
  8. The promoter site and the terminator site for transcription are located at
  9. The human chromosome with the highest and least number of genes in them are respectively
  10. Discontinuous synthesis of DNA occurs in one strand, because
  11. Which of the following are the functions of RNA?
  12. In E.coli, the lac operon gets switched on when
  13. The net electric charge on DNA and histone, is

πŸ“± Download Our App

Learn MCQs on the go with our easy-to-use Android app

Get it on Google Play