Competitive Exams: Zoology MCQs (Practice_Test 33 of 112)

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  1. The thread like structures that begin to radiate from each centromere by the end of prophase are
    1. Spindle microtubules
    2. Kinetochore microtubules
    3. Polar microtubules
    4. Aster microtubutes
  2. In a family, father and son were found to be colour blind. This is due to the defective recessive gene present in
    1. X-chromosome
    2. Y-chromosome
    3. X and Y chromosome
    4. autosomes
  3. In which one of the following stages of mitosis is the maximum chromosomal condensation observed?
    1. Cytokinesis
    2. Prophase
    3. Metaphase
    4. Anaphase
  4. Among the following organisms, the chromosome number is highest in
    1. Columba livia
    2. Gorilla gorilla
    3. Homo sapiens
    4. Oryctolagus cuniculus
  5. Experimental evidence to prove that hormones act first on the cytoplasm and through it on the genes was provided by Clever and Karlson by their work on
    1. Injection of juvenile hormone in chironomus larva
    2. Administration of thyroxine to tadpole larva of frog
    3. Injection of ecdysone hormone in chironomus larva
    4. In vitro incubation of lymphocytes with cortisol
  6. Consider the following statements:
    1. Barr body gives a positive Feulgen reaction
    2. Barr bodies are absent in klinefelter syndrome

    Which of the statements given above is/are correct?

    1. 1 only
    2. 2 only
    3. Both 1 and 2
    4. Neither 1 nor 2
  7. Puffs of the polytene chromosomes of Drosophila are the sites which incorporate
    1. 3H-Uridine
    2. 3H-Thymidine
    3. 3H-Leucine
    4. 3H-Glucose
  8. The first human hormone produced by recombinant DNA technology was
    1. Cortisol
    2. Glucagon
    3. Insulin
    4. Epinephrine
  9. The smallest unit DNA which is capable of under going crossing over and recombination is
    1. cistron
    2. muton
    3. recon
    4. replicon
  10. Chiasmata serve as the points for
    1. attachment of genes
    2. exchange of genes
    3. transposition of genes
    4. deletion of genes
  11. A segment of DNA strand with base sequence of Adenine A, Guanine G, Cytosine C, Thymine T Adenine A, would give rise to the complementary strand of mRNA with base sequence
    1. C, A, U, G, T
    2. U, C, G, A, U
    3. T, C, U, A, G
    4. U, T, U, A, C


  12. Heteromorphic nuclei occur in
    1. Muscle cells
    2. Human germ cells
    3. Neurons
    4. Ciliated protozoan
  13. Haemophilic gene of a father is inherited to
    1. All of his daughters
    2. All-of his sons
    3. 50 % of his daughters
    4. 50 % of his sons
  14. Consider the following
    1. Kappa particles in Paramecium
    2. Shell coiling in Limnaea
    3. Shape of the ear lobe in human beings

    Which of the above is/are the example (s) of cytoplasmic/extranuclear inheritance

    1. 1only
    2. 2 and 3
    3. 1 and 2
    4. 3 only
  15. In protein synthesis, the enzyme the catalyses peptide bonding is located the
    1. Leader sequence of the mRNA
    2. Central part of the tRNA
    3. Smaller subunit of the ribosome
    4. Larger subunit of the ribosome

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