Molecular Basis of Inheritance MCQs Mock Test of Class 12th Biology

Welcome to your Molecular Basis of Inheritance MCQs Mock Test of Class 12th Biology

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Question 1. The process of copying genetic information from one strand of DNA to RNA is termed as _________ .
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Question 2. The enzyme DNA dependent RNA polymerase catalyses the polymerisation reaction in ___________direction.
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Question 3. If the sequence of bases in coding strand of DNA is ATTCGATG, then the sequence of bases in mRNA will be
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Question 4. If the sequence of bases in DNA is GCTTAGGCAA then the sequence of bases in its transcript will be
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Question 5. In a DNA strand the nucleotides are linked together by
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Question 6. The net electric charge on DNA and histones is
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Question 7. Which of the following statements is the most appropriate for sickle cell anaemia ?
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Question 8. The first genetic material could be
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Question 9. The human chromosome with the highest and least number of genes in them are respectively
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Question 10. Who amongst the following scientist had no contribution in the development of the double helix model for the structure of DN A ?
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Question 11. Which of the following steps in transcription is catalysed by RNA polymerase ?
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Question 12. Control of gene expression takes place at the level of
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Question 13. Which was the last human chromosome to be completely sequenced ?
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Question 14. In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called
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Question 15. If the sequence of initrogen bases of the coding strand of DNA in a transcription unit is: 5’ – ATGAATG – 3’, the sequence of bases in its RNA transcript would be
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Question 16. The RNA polymerase holocnzyme transcribes
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Question 17. If the base sequence of a codon in mRNA is 5’ – AUG – 3′ the sequence of tRNA pairing with it must be
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Question 18. The amino acid attaches to the tRNA at its
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Question 19. In a n/RNA molecule, untranslated regions (UTRs) are present at
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Question 20. UTRs are the untranslated regions present on
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Question 21. Which of the following statements is correct regarding ribosomes ?
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Question 22. Regulation of gene expression occurs at the level of
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Question 23. During expression of an operon, RNA polymerase binds to
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Question 24. The sequence of structural genes in lac operon is
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Question 25. To initiate translation, the wiRNA first bind to
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Question 26. In E. colt, the lac operon gets switched on when
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Question 27. In DNA strand, the nucleotides are linked together by
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Question 28. If a double stranded DNA has 20% of cytosine, what will be the percentage of adenine in it ?
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Question 29. If the sequence of bases in one strand of DNA is ATGCATGCA, what would be the sequence of bases on complementary strand ?
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Question 30. How far is each base pair from the next one in DNA double helix model ?
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Question 31. Synthesis of DNA from RNA is explained by
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Question 32. Histone proteins are
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Question 33. The structure in chromatin seen as ‘beads-on string’ when viewed under electron microscope are called
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Question 34. Find out the wrong statement about heterochromatin,
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Question 35. They year 2003 was celebrated as the 50th anniversary of discovery of
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Question 36. The process of transofrmation is not affected by which of the following enzymes ? A. DNase B. RNase C. Peptidase D. Lipase
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Question 37. The three codons which result in the termination of polypeptide chain synthesis are
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Question 38. Amino acids which are specified by single codons are
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Question 39. Which out of the following statements is incorrect ?
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Question 40. Some amino acids are coded by more than one codon, hence the genetic code is
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Question 41. The mutations that involve addition, deletion or substitution of a single pair in a gene are referred to as
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Question 42. Sickle cell anemia results from a single base substitution in a gene, thus it is an example of
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Question 43. Select the incorreclty matched pair.
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Question 44. Amino acid acceptor end of tRNA lies at
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Question 45. Which RNA carries the amino acids from the amino acid pool to mRnA during protein synthesis ?
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Question 46. During translation, activated amino acids get linked to tRNA. This process is commonly called as
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Question 47. To prove that DNA is the genetic material, which radioactive isotopes were used by Hershey and Chase (1952) in experiments ?
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Question 48. RNA is the genetic material in
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Question 49. Which one among the following was the first genetic material ?
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Question 50. Which of the following life processes is evolved around RNA ?

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