Competitive Exams: Zoology MCQs (Practice-Test 28 of 112)

  1. During cell division, one of the cell organelles instead of being equally divided between the two daughter cells at cytokinesis, becomes dispersed into small vesicles at prophase to reassociate at telophase. This organelle is

    1. Mitochondria

    2. endoplasmic reticulum

    3. golgi apparatus

    4. centriole

  2. AIDS-causing HIV identifies its target cells by recognizing

    1. Low density lipoproteins in cell membranes

    2. apoproteins in the coated pits of membranes

    3. gates channels in the membranes

    4. carbohydrates of glycocalyx

  3. Meiosis in human female starts

    1. in embryo

    2. after puberty

    3. immediately after birth

    4. at puberty

  4. Match List I with List II and select the correct answer:

    List-I (Mitochondrial enzymes) List-II (Location of enzymes)
    1. Cytochrome oxidase

    2. Fatty acid CoA ligase

    3. Adenylate kinase

    4. Malate dehydrogenase

    1. Outer chamber of mitochondria

    2. Inner membrane of mitochondria

    3. Mitochondrial matrix Outer membrane of mitochondria

    4. Polyribosomes attached to mitochondria

    • A
    • B
    • C
    • D
      • 1
      • 3
      • 5
      • 4
      • 2
      • 4
      • 1
      • 3
      • 1
      • 4
      • 5
      • 3
      • 2
      • 3
      • 1
      • 4
  5. Ribosomes (80 S) can be dissociated into two sub units (60 S and 40S). The two sub units again can re-form the 80 S unit. What is the divalent cation in the presence of which such conversions take place?

    1. Mg + +

    2. Ca + +

    3. Fe + +

    4. Cu + +

  6. Which one of the following pairs is correctly matched?

      • Shortest phase of cell cycle
      • M-phase
      • Synthesis of histone protein
      • G2-phase
      • DNA replication
      • G1-phase
      • Synthesis of RNA and protein
      • Sphase
  7. Consider the following statements: cDNA libraries are prepared from isolated

    1. tRNAs

    2. rRNAs

    3. mRNAs

    Which of these statements is/are correct?

    1. 1 and 2

    2. 2 only

    3. 2 and 3

    4. 3 only

  8. Genetic recombination takes place during

    1. prophase of meiotic division-I

    2. metaphase of meiotic division-II

    3. prophase of meiotic division-II

    4. metaphase of meiotic division-I

  9. Which one of the following is tightly bound to the cell membrane?

    1. cAMP

    2. Adenylate cyclase

    3. Ribonuclease

    4. ATP

  10. An interaction between non-allelic genes in which an allele at one locus prevents expression of an allele at another locus but not vice versa, is called

    1. complementation

    2. modification

    3. epistasis

    4. disordance

  11. The numerous antibodies that provide immunity are proteins, whose specificity and diversity are achieved, by

    1. having large number of separate genes, each encoding separate antibody

    2. the expression of multiple fragments of a few genes

    3. the amplification of the desires gene (s)

    4. the reiteration of the concerned gene (s)

  12. Which of the following is a mucopolysaccharide?

    1. Fibrinogen

    2. ? -globulin

    3. Chitin

    4. Hyaluronic acid

  13. Match List I with list II and select the correct answer

    List-I (Factors/Enzymes) List-II (Activities)
    1. Sigma factor

    2. Rho factor

    3. DNA polymerase

    4. Amino-acyl synthetase

    1. Termination of transcription

    2. Removal of RNA primer from newly synthesized DNA strand

    3. Correct initiation of transcription

    4. Correct initiation of DNA replication

    5. Attachment of amino acid to tRNA

    • A
    • B
    • C
    • D
      • 2
      • 5
      • 4
      • 1
      • 3
      • 1
      • 2
      • 5
      • 2
      • 1
      • 4
      • 5
      • 3
      • 5
      • 2
      • 1
  14. During cell division, a chromatid becomes a chromo in some as soon as

    1. its centromere has divided

    2. it starts moving to the opposite pole

    3. it reaches the opposite pole

    4. the two daughter nuclei are formed

  15. Which one of the following is ABSENT in a prokaryotic chromosome?

    1. Histone

    2. Phycobilin

    3. Collagen

    4. Elastin