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

Question 1. The process of copying genetic information from one strand of DNA to RNA is termed as _________ .

Question 2. The enzyme DNA dependent RNA polymerase catalyses the polymerisation reaction in ___________direction.

Question 3. If the sequence of bases in coding strand of DNA is ATTCGATG, then the sequence of bases in mRNA will be

Question 4. If the sequence of bases in DNA is GCTTAGGCAA then the sequence of bases in its transcript will be

Question 5. In a DNA strand the nucleotides are linked together by

Question 6. The net electric charge on DNA and histones is

Question 7. Which of the following statements is the most appropriate for sickle cell anaemia ?

Question 8. The first genetic material could be

Question 9. The human chromosome with the highest and least number of genes in them are respectively

Question 10. Who amongst the following scientist had no contribution in the development of the double helix model for the structure of DN A ?

Question 11. Which of the following steps in transcription is catalysed by RNA polymerase ?

Question 12. Control of gene expression takes place at the level of

Question 13. Which was the last human chromosome to be completely sequenced ?

Question 14. In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called

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

Question 16. The RNA polymerase holocnzyme transcribes

Question 17. If the base sequence of a codon in mRNA is 5’ – AUG – 3′ the sequence of tRNA pairing with it must be

Question 18. The amino acid attaches to the tRNA at its

Question 19. In a n/RNA molecule, untranslated regions (UTRs) are present at

Question 20. UTRs are the untranslated regions present on

Question 21. Which of the following statements is correct regarding ribosomes ?

Question 22. Regulation of gene expression occurs at the level of

Question 23. During expression of an operon, RNA polymerase binds to

Question 24. The sequence of structural genes in lac operon is

Question 25. To initiate translation, the wiRNA first bind to

Question 26. In E. colt, the lac operon gets switched on when

Question 27. In DNA strand, the nucleotides are linked together by

Question 28. If a double stranded DNA has 20% of cytosine, what will be the percentage of adenine in it ?

Question 29. If the sequence of bases in one strand of DNA is ATGCATGCA, what would be the sequence of bases on complementary strand ?

Question 30. How far is each base pair from the next one in DNA double helix model ?

Question 31. Synthesis of DNA from RNA is explained by

Question 32. Histone proteins are

Question 33. The structure in chromatin seen as ‘beads-on string’ when viewed under electron microscope are called

Question 34. Find out the wrong statement about heterochromatin,

Question 35. They year 2003 was celebrated as the 50th anniversary of discovery of

Question 36. The process of transofrmation is not affected by which of the following enzymes ? A. DNase B. RNase C. Peptidase D. Lipase

Question 37. The three codons which result in the termination of polypeptide chain synthesis are

Question 38. Amino acids which are specified by single codons are

Question 39. Which out of the following statements is incorrect ?

Question 40. Some amino acids are coded by more than one codon, hence the genetic code is

Question 41. The mutations that involve addition, deletion or substitution of a single pair in a gene are referred to as

Question 42. Sickle cell anemia results from a single base substitution in a gene, thus it is an example of

Question 43. Select the incorreclty matched pair.

Question 44. Amino acid acceptor end of tRNA lies at

Question 45. Which RNA carries the amino acids from the amino acid pool to mRnA during protein synthesis ?

Question 46. During translation, activated amino acids get linked to tRNA. This process is commonly called as

Question 47. To prove that DNA is the genetic material, which radioactive isotopes were used by Hershey and Chase (1952) in experiments ?

Question 48. RNA is the genetic material in

Question 49. Which one among the following was the first genetic material ?

Question 50. Which of the following life processes is evolved around RNA ?