Paper : C.S.E. ZOOLOGY SAMPLE QUESTION PAPER FOR PRELIMINARY EXAMINATION

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Two Hours Maximum Marks: 300

1. Which of the following are the characteristics of prokaryotes?

(a) Single chromosome made up of nucleic acid complexed with histone and 70 S ribosome comprised of 30 S and 50 S.
(b) Single chromosome made up of naked nucleic acid and 70 S ribosome comprised of 30 Sand 50 S.
(c) Single chromosome made up of nucleic acid complexed with histone and 80 S ribosome comprised of 40 S and 50 S.
(d) Single chromosome made up of naked nucleic acid and 80 S ribosome comprised 30 Sand 50 S.

2. The amount of DNA in G1 phase of cell cycle is
(a) Same as found in G2 phase
(b) Half the amount found in G2 phase
(c) Double the amount found in G2 phase
(d) Four times the amount found in G2 phase

3. Consider the following statements:
I. Friedrich Miescher first isolated nucleic acids from pus cells.
2. Hershey and Chase showed through experiment that genetic material was DNA and not protein.
3. Meselson and Stahl proved the semi-conservative replication of DNA.

Which of the statements given above are correct?
(a) 1 and 2 (b) 2 and 3
(c) 1 and 3 (d) 1,2 and 3

4. The nucleolar organiser is located on the chromosome in the region of
(a) Primary constriction (b) Secondary constriction
(c) Kinetochore (d) Telomere

5. During cell-cycle, the duration of which ofthe following phases is the shortest?
(a) Mitosis (b) G. phase
(c) S phase (d) G2 phase

6. Prions are disease causing agents composed of
(a) DNA and protein. (b) DNA
(c) RNA (d) Protein

7. Consider the following statements:
I. In the lampbrush chromosomes of am phibian oocytes, the loops are engaged in the transcription.
2. In polytene chromosomes, the puffs are the sites of mRNA formation.

Which of the statements given above is/are correct?
(a) I only (b) 2 only
(c) Both I and 2 (d) Neither I nor 2

8. Which one among the following has the largest number of chromosomes?
(a) Cat (c) Man
(b) Chicken (d) Rat

9. Consider the following statements regarding a DNA segment 1000 base pair long:
1. It measures 3400 A.
2. It has 10 complete turns. .
3. It has 100 nucleotides.
4. The RNA synthesized from it carries 1000 nucleotides.

Which of the statements given above are correct?
(a) I and 2 (b) 3 and 4
(c) I and 4 (d) 1, 3 and 4

10. Which types of specialized sequences are carried at both ends of linear chromosomes for faithful DNA replication, aging and maintaining polarity?

(a) Satellites (b) Telomeres
(c) Organisers (d) Repetitive sequences

12. Which one of the following combinations of structural features are expected to be present in a secretory cell?

(a) Well developed rough endoplasmic reticulum and prominent Golgi bodies
(b) Abundant Iysosomes and secretory granules
(c) Enlarged nucleus and well developed rough endoplasmic reticulum
(d) Well developed smooth endoplasmic reticulum and secretory granules

13. A couple with normal vision had colour blind father each. What is the percentage of probability that the daughter of the couple is colour blind?
(a) 100% (b) 50%
(c) 25% (d) 0

14. How many molecules of ATP would be synthesised if one pyruvate molecule passes through the oxidative steps?
(a) 12 (b) 14
(c) 24 (d) 28

16. Consider the following statements:

1. Peroxisomes contain amino acid oxidases, urate oxidases and catalases.
2. In mitochondria, the Krebs-cycle reactions occur in the outer mitochondrial membrane.

Which of the statements given above is/are correct?
(a) I only (b) 2 only
(c) Both I and 2 (d) Neither 1 nor 2

17. Sickle cell anemia is due to the substitution of
(a) Glutamic acid for valine at 6th position in beta-chain
(b) Valine for glutamic acid at 6th position in beta-chain
(c) Valine for glutamic acid at 5th position in beta-chain
(d) Glutamic acid for valine at 5th position in beta-chain

18. Consider the following pairs:
1. Ribosomes : Protein synthesis
2. Okazaki fragment : RNA synthesis
3. Ligase : DNA synthesis

Which of the above pairs is/are correctly matched?
(a) 1 only (b) 2 and 3
(c) I and 3' (d) 1, 2 and 3

19. Philadelphia chromosome refers to the translocation between the long arms of
(a) Chromosomes 8 and 18
(b) Chromosomes 9 and 18
(c) Chromosomes 9 and 22
(d) Chromosomes 6 and 22

20. Consider the following statements with reference to prokaryotic translation:.
1. Charged tRNA carries amino acid at 5 end.
2. Charged tRNA enters the ribosome through A site during elongation of polypeptides.
3. Ribosomes can accommodate 3 mRNA codons at a time.
4. mRNA is translated from 5’ -> 3 direction.

Which of the statements given above. are correct?
(a) 1 and 2 (b) 3 and 4
(c) 1 and 3 (d) 2 and 4

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