Competitive Exams: Zoology MCQs (Practice-Test 74 of 112)

  1. In ciliate protozoans like Paramecium, two types of nuclei occur, the larger macronucleus and the smaller micronucleus. Which one the following statement is NOT true about them?

    1. The macronucleus contains genes only for vegetative phase of life.

    2. The micronucleus contains genes only for completion of sexual reproduction.

    3. The micronucleus contains the full genetic endowment of organism for both vegetative and sexual phases of life.

    4. The macronucleus is a collection of multiple polyploidy copes of only those segments of chromosomes that contains genes associated with the somatic life of the organism

  2. In the statement ‘cell biologists can successfully fuse a human fibroblast with a mouse tumour cell to form a cell with two nuclei (see given figure) known as X which eventually proceeds to mitosis and produce Y having all the chromosomes inside a single large nucleus’ X and Y stand respectively for

    1. Nuclear hetrogenate and hetrerocayon

    2. Heterocaryon and hybrid cell

    3. Hybrid cell and nuclear heterogenate

    4. Hybrid cell and heterocaryon

  3. Match List I (Function of proteins of cyoskeleton) with List II (Proteins involved in the given functions) and select the correct answer using the codes given below the lists:

    List-I List-II
    1. Contraction of micmfaments

    2. Inhibition of polymerization of microtubules

    3. Depolymerization of microfilaments

    4. Movement of cilia and flagella

    1. Cytochalasin B

    2. Actin

    3. Dynein

    4. Calinodulin

    • A
    • B
    • C
    • D
      • 2
      • 4
      • 1
      • 3
      • 2
      • 4
      • 3
      • 1
      • 4
      • 2
      • 1
      • 3
      • 4
      • 2
      • 3
      • 1
  4. Consider the following components:

    1. Transitional elements of ER

    2. RER

    3. Golgi complex

    4. Zymogen granules

    5. Lumen of the pancreas

    The direction of flow in the secretary pathway of secreting protein in the opaucreatic cell is

    1. 1, 2, 3, 4, 5

    2. 2, 1, 3, 4, 5

    3. 2, 1, 4, 3, 5

    4. 1, 2, 4, 3, 5

  5. Short DNA fragments referred to as Okazaki pieces are synthesized during DNA replication. The template strand for their synthesis is

    1. Each of the strands of DNA duplex

    2. Leading strand of DNA

    3. Lagging strand of DNA

    4. Single-strand DNA of virus like f X − 174

  6. In Drosophila, black body (b) is recessive to grey body (B); vestigial (V) wings is recessive to long (V) wing. The two loci are 19 map units apart on an auto some. A cross is made as indicated below:

    • B V b v = = = = = = = = x = = = = = = = = b V b v
    • Grey-bodied Black-bodied
    • Long-winged vestigial-winged
    • Male Female
    • What will be the frequency of phenotypes in the next generation?
    • Greybodied longwinged
    • Greybodied vestigialwinged
    • Block bodied longwinged
    • Blackbodied vestigial winged

    Which is correct?

    1. 50%--50%

    2. -50% 50%-

    3. 41% 9% 9% 41%

    4. 9% 41% 41% 9%

  7. Early investigators studied various aspects (List I) of chromosomes by employing diverse techniques (List II), Match List I with List II and select the correct answer using the codes given below the lists

    List-I List-II
    1. The most important component of Eukaryote chromosome

    2. Denaturation and renaturation kinetics

    3. Late replication of X chromosome in mammalian females

    4. Semi conservative replication of a prokaryote genome

    1. Ultraviolet absorption

    2. Density gradient equilibrium ultracentrifugation

    3. Fulegen reaction

    4. Autoradiography

    • A
    • B
    • C
    • D
      • 3
      • 1
      • 4
      • 2
      • 3
      • 1
      • 2
      • 4
      • 1
      • 3
      • 2
      • 4
      • 1
      • 3
      • 4
      • 2
  8. Persons carrying the dominant gene (s) can taste a particular chemical and are called tasters. The others are non-tasters (11), a large random-mating human population at the Hardy-Weinberg equilibrium, there are 36% tasters and 64% non-tasters. The frequency of heterozygote in the population is

    1. 6%

    2. 8%

    3. 32%

    4. 48%

  9. It in a DNA template, the sequence of bases is AGGATAACC, which one of the following would be the correct sequence of base of a messenger RNA transcribed from it?

    1. TCCUAGOT

    2. UCCUAUUGG

    3. TCCUUGGTT

    4. AGGAUAACC

  10. A replicating fork along with the direction (shown by arrow) of migration of DNA polymerase on the leading strand is shown in the given figure. The ends A, B, C and D are respectively.

    1. 5 ‘5’ 5 ‘and 3’

    2. 3 ‘5’ 3 ‘and 5’

    3. 5 ‘3’ 5 ‘and 3’

    4. 3 ‘3’ 3 ‘and 5’

  11. A cross was made between a male and a female Drosophila. The progeny consisted of made and female in the ratio of 1: 2. Which one of the following accounts for tile variation in the sex ratio

    1. The presence of a sex-linked lethal recessive gene in the parental female fruit fly.

    2. Non-disjunction during oogenesis in the female fruit fly.

    3. Appearance of a sudden mutation in the Y chromosome of the parental male fruit fly.

    4. Non-disjunction during spermatogenesis in the male fruit fly.

  12. A colour-blind female who is carrier for hemophilia marries a normal male. The frequency of incidence of each character amount the male and female children will be such that Male Female

    1. 50% colour-blind, 50% colour blind 50% hemophilic 50% normal

    2. 50% normal; 100% normal 50% colour-blind and hemophilic

    3. 100% colour-blind; 50% normal 50% colour-blind

    4. 50% colour-blind, 100% normal 50% colour-blind and hemophilic

  13. Consider the following diseases/syndromes:

    1. Huntington's chorea

    2. Galactosemia

    3. Duchenne muscular dystrophy

    4. Phenyliketonuria

    Those attributed to recessive mutations in human beings include

    1. l, 2 and 3

    2. 2, 3 and 4

    3. 2 and 4

    4. 1 and 3

  14. The given is a pedigree chart of human genetic disease. The situation responsible for the sudden reappearance of the genetic disease in generation IV is

    1. Congruency

    2. Consanguinity

    3. Environmental effect

    4. Reverse mutation

  15. A eukaryotic mRNA and the protein it synthesized are shown in the given figure. The ends A and D and a the segments B and C are A B C D

    1. 3 ‘cap poly A 5’

    2. 3 ‘poly A cap 5’

    3. 5 ‘Poly A cap 3’

    4. 5 ‘cap poly A 3’