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Q.14. In E. colt, the lac operon gets switched on when

  1. lactose is present and it binds to the repressor
  2. repressor binds to operator
  3. RNA polymerase binds to the operator
  4. lactose is present and it binds to RNA polymerase.
Answer: (a) lactose is present and it binds to the repressor
Explanation: In E. colt, the lac operon gets switched on when lactose is present and it binds to the repressor

Molecular Basis Of Inheritance (class 12th Biology) Revision Test | MCQs For NEET

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This practice test includes 25 important multiple-choice questions (MCQs) from the chapter - Molecular basis of inheritance (Class 12th Biology). attempt this test and revise this chapter to be fully prepared for the upcoming exam. these questions will be helpful for upcoming NEET, Aiims, and other entrance level exams. Start Test without Login in
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Q.1. Which of the following statements is the most appropriate for sickle cell anaemia ?

  1. It cannot be treated with iron supplements.
  2. It is a molecular disease.
  3. It conferes resistance to acquiring malaria
  4. All of the above.

Q.2. The first genetic material could be

  1. protein
  2. cabohydrates
  3. DNA
  4. RNA

Q.3. The human chromosome with the highest and least number of genes in them are respectively

  1. chromosome 21 and Y
  2. chromosome 1 and X
  3. chromosome 1 and Y
  4. chromosome X and Y

Q.4. Who amongst the following scientist had no contribution in the development of the double helix model for the structure of DN A ?

  1. Rosalind Franklin
  2. Maurice Wilkins
  3. Erwin Chargaff
  4. Meselson and Stahl

Q.5. Which of the following steps in transcription is catalysed by RNA polymerase ?

  1. Initiation
  2. Elongation
  3. Termination
  4. All of the above

Q.6. Control of gene expression takes place at the level of

  1. DNA-replication
  2. transcription
  3. translation
  4. none of the above

Q.7. Which was the last human chromosome to be completely sequenced ?

  1. Chromosome 1
  2. Chromosome 11
  3. Chromosome 21
  4. Chromosome X

Q.8. In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called

  1. A – DNA
  2. B – DNA
  3. cDNA
  4. rDNA

Q.9. 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

  1. 5’ – AUG A AUG – 3’
  2. 5’ – UACUU AC – 3’
  3. 5’ – CAUUCAU – 3’
  4. 5’ – GUAAGUA – 3’.

Q.10. The RNA polymerase holocnzyme transcribes

  1. the promoter, structural gene and the terminator region
  2. the promoter and the terminator region
  3. the structural gene and the terminator region
  4. the structural gene only.

Q.11. If the base sequence of a codon in mRNA is 5’ – AUG – 3′ the sequence of tRNA pairing with it must be

  1. 5’ – UAC – 3’
  2. 5’ – CAU – 3’
  3. 5’-AUG – 3’
  4. 5’ – GUA – 3’

Q.12. The amino acid attaches to the tRNA at its

  1. 5’- end
  2. 3’ – end
  3. anticodon site
  4. DHUloop.

Q.13. To initiate translation, the wiRNA first bind to

  1. the smaller ribosomal sub-unit
  2. the larger ribosomal sub-unit
  3. the whole ribosome
  4. no such specificity exists

Q.14. In E. colt, the lac operon gets switched on when

  1. lactose is present and it binds to the repressor
  2. repressor binds to operator
  3. RNA polymerase binds to the operator
  4. lactose is present and it binds to RNA polymerase.

Q.15. In DNA strand, the nucleotides are linked together by

  1. glycosidic bonds
  2. phosphodiester bonds
  3. peptide bonds
  4. hydrogen bonds

Q.16. If a double stranded DNA has 20% of cytosine, what will be the percentage of adenine in it ?

  1. 20%
  2. 40%
  3. 30%
  4. 60%

Q.17. If the sequence of bases in one strand of DNA is ATGCATGCA, what would be the sequence of bases on complementary strand ?

  1. ATGCATGCA
  2. AUGCAUGCA
  3. TACTACGT
  4. UACGUACGU

Q.18. How far is each base pair from the next one in DNA double helix model ?

  1. 2 nm
  2. 3.4 nm
  3. 34 nm
  4. 0.34 nm

Q.19. Synthesis of DNA from RNA is explained by

  1. central dogma reverse
  2. reverse transcription
  3. feminism
  4. all of these

Q.20. Histone proteins are

  1. basic, negatively charged
  2. basic, positively charged
  3. acidic, positively charged
  4. acidic, negatively charged

Q.21. The structure in chromatin seen as ‘beads-on string’ when viewed under electron microscope are called

  1. nucleotides
  2. nucleosides
  3. histone octamer
  4. nucleosomes

Q.22. Find out the wrong statement about heterochromatin,

  1. It is densely packed
  2. It stains dark
  3. It is transcriptionally active.
  4. It is late replicating

Q.23. They year 2003 was celebrated as the 50th anniversary of discovery of

  1. transposons by Barbare Me Clintock
  2. structure of DNA by Watson and Crick
  3. Mendel’s laws of inheritance
  4. biotechnology by Kary Muliis.

Q.24. Amino acids which are specified by single codons are

  1. phenylalanine and arginine
  2. tryptophan and methionine
  3. valine and proline
  4. methionine and aroinine

Q.25. Which out of the following statements is incorrect ?

  1. Genetic code is ambiguous.
  2. Genetic code is deqenerate
  3. Genetic code is universal
  4. Genetic code is non-overlanning.
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