NEET BIOLOGY QUIZ MOLECULAR BASIS OF INHERITANCE Q SEP 8

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NEET Biology – Molecular Basis of Inheritance

Two practice tests • 15 MCQs each • Correct answers are revealed beside the questions after submission.

NEET Biology Test 1 – Molecular Basis of Inheritance

15 questions • Select one answer for each question

1. First evidence in favour of DNA as genetic material came from:

A. Griffith effect B. Conjugation C. Taylor's experiment D. Cairn's effect

2. Eukaryotic mRNA requires post-transcriptional processing mainly because eukaryotic transcripts contain:

A. Only exons B. Introns that must be removed C. Only promoters D. Only terminators

3. A useful process for determining whether an individual is homozygous or heterozygous is:

A. Self-fertilisation B. Back-crossing C. Test cross D. Hybridisation

Study resource: Answers – English Medium

4. The enzyme known as Kornberg enzyme is:

A. DNA polymerase I B. DNA polymerase II C. DNA polymerase III D. RNA polymerase

5. A DNA segment has 80 thymine and 90 guanine bases. The total number of nucleotides is:

A. 160 B. 340 C. 80 D. 170

6. Which is NOT a component of a transcription unit?

A. Promoter B. Structural gene C. Terminator D. Inducer

Study resource: Answers – Tamil Medium

7. Hershey and Chase provided the unequivocal proof that DNA is the genetic material. They used:

A. Pea plants B. Bacteriophages C. Neurospora D. Drosophila

8. RNA having a clover-leaf-like secondary structure is:

A. mRNA B. rRNA C. tRNA D. hnRNA

9. Separation of DNA fragments into bands by electrophoresis is commonly carried out on:

A. Agarose gel B. Cellulose paper C. Starch only D. Chitin gel

Study resource: NEET Practice Papers

10. If DNA contains 10,000 base pairs, its approximate length is:

A. 340 nm B. 3,400 nm C. 34,000 nm D. 340,000 nm

11. The bond between adjacent nucleotides in a DNA strand is a:

A. Hydrogen bond B. Peptide bond C. Phosphodiester bond D. Glycosidic bond

12. Synthesis of DNA from an RNA template is called:

A. Translation B. Reverse transcription C. Translocation D. Replication fork formation

Study resource: NEET English Medium

13. The experimental proof for semi-conservative replication of DNA was first shown in:

A. A bacterium B. A plant C. A fungus D. A virus

14. In an AB × AB blood-group cross, the expected A : AB : B phenotype ratio is:

A. 1 : 1 : 1 B. 1 : 2 : 1 C. 2 : 1 : 1 D. 3 : 1

15. The first correct double-helix model of DNA was worked out by:

A. Griffith and Avery B. Watson and Crick C. Jacob and Monod D. Beadle and Tatum

NEET Biology Test 2 – Molecular Basis of Inheritance

15 questions • Select one answer for each question

1. DNA as an acidic substance in the nucleus was first identified in 1869 by:

A. Watson B. Miescher C. Chargaff D. Franklin

2. A single-stranded nucleic acid tagged with a radioactive molecule is called a:

A. Vector B. Probe C. Plasmid D. Selectable marker

3. The final proof for DNA as the genetic material came from the experiments of:

A. Griffith B. Hershey and Chase C. Avery, MacLeod and McCarty D. Khorana

Study resource: NEET Tamil Medium

4. In a repressible operon, the end product generally acts as a:

A. Inducer B. Corepressor C. Promoter D. Terminator

5. The RNA polymerase holoenzyme transcribes the:

A. Promoter only B. Structural gene and terminator region C. Promoter only and not structural gene D. Operator only

6. How many codons are used to code for the 20 amino acids?

A. 20 B. 60 C. 61 D. 64

Study resource: JEE Maths

7. DNA precipitation during isolation can be achieved using:

A. Chilled ethanol B. Boiling water C. Chilled chloroform D. Acidified glucose

8. The unidirectional flow of genetic information called the central dogma was given by:

A. F.H.C. Crick B. Temin C. Baltimore D. Dulbecco

9. If thymine constitutes 35% of a DNA double helix, guanine constitutes:

A. 35% B. 70% C. 30% D. 15%

Study resource: JEE Physics

10. A nucleoside differs from a nucleotide because a nucleoside lacks the:

A. Nitrogenous base B. Sugar C. Phosphate group D. Hydroxyl group

11. In mature eukaryotic mRNA:

A. Only introns appear B. Exons appear but introns do not C. Both introns and exons appear D. Neither appears

12. The coding sequences in split genes are called:

A. Introns B. Exons C. Operons D. Operators

Study resource: JEE Chemistry

13. The lac Z gene codes for:

A. Permease B. Transacetylase C. β-galactosidase D. Repressor

14. The three stop codons in the genetic code are:

A. AUG, UAA, UGA B. UAA, UAG, UGA C. UGG, UGA, UAG D. AUG, UAG, UGG

15. DNA-dependent DNA polymerase synthesises DNA in the:

A. 3′ → 5′ direction B. 5′ → 3′ direction C. Both directions on one strand D. Random direction

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