Biology Class 12 MCQ Molecular Basis Of Inheritance – Chapter 6 : Do you want to score good marks in your class 12 board examinations, so the only way to make your dreams come true is by doing thorough revision of all the topics that are going to come in your examination. Give mock tests, prepare from sample papers, previous year papers and many more.
In this article, we have provided you with some important questions on Molecular Basis Of Inheritance from biology class 12, so scroll down the page and do practice these questions thoroughly, so that you can score full marks in objective type questions asked in your board examinations.
Biology Class 12 MCQ Molecular Basis Of Inheritance – Chapter 6
Ques 1: The initiation codon is
- AUG
- UAA
- UAG
- UGA
AUG
Ques 2: The terminator codon is
- UAA
- UAG
- UGA
- All of these
All of these
Ques 3: Who proposed Operon hypothesis for the regulation of gene action ?
- Meselson and Stahl
- Hershey and Chase
- Jacob and Monod
- Nirenberg and Khorana
Jacob and Monod
Ques 4: Each nucleotide, in DNA molecule, is linked to the next by
- lycosidic bond
- phosphodiester bond
- hydrogen bond
- electrostatic bond
phosphodiester bond
Ques 5: The two polynucleotide chains of DNA molecule w.rt. bases are
- identical
- complementary to each other
- varibale
- None of these
complementary to each other
Ques 6: The two polynucleotide chains of DNA molecule are spirally coiled to form a double helix. The helix is generally
- right handed
- left handed
- at place right handed and at other places left handed
- None of these
right handed
Ques 7: The transcribed hnRNA is to be processed which involves
- capping
- tailing
- splicing
- All of these
All of these
Ques 8: Splicing involves
- addition of a methyl guanosine triphosphate
- addition of poly A tail
- removal of introns through cutting and joining the exons in a defined order
- All of these
removal of introns through cutting and joining the exons in a defined order
Ques 9: Following RNA(s) are involved in protein synthesis?
- mRNA
- tRNA
- rRNA
- All of these
All of these
Ques 10: Protein synthesis starts with the
- activation of amino acids
- activation of ribosomes
- charging of tRNA
- None of the above
activation of amino acids
Ques 11: One gene one enzyme hypothesis was given by
- Meselson and Stahl
- Jacob and Mood
- Beadle and Tatum
- Watson and Crick
Beadle and Tatum
Ques 12: Structural genes are termed
- mutons
- introns
- recons
- citrons
citrons
Ques 13: Which of teh following enzymes can polymerise the deoxyribonucleotides in 5′-3′ direction during DNA replication ?
- DNA ligase
- DNA polymerase
- Topoisomerase
- Nuclease
DNA polymerase
Ques 14: The abnormal regions of DNA resulting from mutations are cleaved by which enzymes.
- Nucleases
- DNA polymerases
- RNA polymerases
- DNA ligases
Nucleases
Ques 15: A triplet base on mRNA chain is called
- anticodon
- codon
- both (a) and (b)
- neither (a) nor (b)
codon
Ques 16: Which step in transcription is catalyzed by RNA polymerase ?
- Termination
- Initiation
- Elongation
- All of these
Elongation
Ques 17: Which of the following human chromosomes was the last to be completely sequenced ?
- Chromosome X
- Chromosome II
- Chromosome 21
- Chromosome I
Chromosome I
Ques 18: Which is not a part of a transcription unit in DNA?
- Promoter
- Inducer
- Terminator
- Structural gene
Inducer
Ques 19: The number of codons that code 20 different amino acids is
- 64
- 61
- 60
- 32
61
Ques 20: A nucleoside differs from a nucleotide in not having
- sugar
- Phosphate group
- Nitrogen base
- glucose
Phosphate group
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We hope that you have practiced these questions on Molecular Basis Of Inheritance, and you will be feeling more confident about the objective part of this chapter. Our ultimate aim is to help you gain good marks in your board examinations, so keep on practicing. For more mock tests, stay in touch with the page.