Admission Tests: Zoology MCQs (Practice Test 80 of 112)

  1. A competitive inhibitor

    1. Increases the Km of an enzyme

    2. Decreases the Km of an enzyme

    3. Increases both Vmax and Km of an enzyme

    4. Decreases the Km but increases the

    Vmax of an enzyme

  2. Match List-I with List-II and select the correct answer

    List-I List-II
    1. Vanadium

    2. Cobalt

    3. Iron

    4. Magnesium

    1. Euglena

    2. Tetrahymena

    3. Ascidians

    4. Chironomus larva

    • A
    • B
    • C
    • D
      • 2
      • 3
      • 4
      • 1
      • 3
      • 2
      • 1
      • 4
      • 2
      • 3
      • 1
      • 4
      • 3
      • 2
      • 4
      • 1
  3. Uric acid is the chief end-product of nitrogenous excretion in adult reptiles and birds. It is often excreted in concentrated crystalline form. This pattern of excretion is mainly an adaptation for

    1. Conservation of urea producing enzymes

    2. Raising osmotic concentration of blood

    3. Conservation of water

    4. Storage of waste materials

  4. Uncoupling agents like 2, 4-dinitrophenol influence mitochondrial function by

    1. Inhibiting phosphorylation

    2. Stimulating phosphorylation and inhibiting respiration

    3. Stimulating both respiration and phosphorylation

    4. Inhibiting both respiration and phosphorylation

  5. Which one of the following statements is correct?

    1. Chloride shift or Hamburger phenomenon occurs from the blood to liver in a freshwater fish to maintain its osmotic balance

    2. Chloride shift takes place from stomach to the blood vascular system of man to produce HCI

    3. Chloride shift involves the passage of chloride ions from the plasma to RBC to balance the bicarbonate ions which have passed out from RBC into plasma

    4. Chloride shift occurs to balance choride ions and sodium ions in a muscle cell during muscle contraction

  6. Match List I with List II and select the correct answer

    List-I List-II
    1. Biotin

    2. Thiamine

    3. Nicotinic Acid

    4. Calciferol

    1. Ricket

    2. Pellagra

    3. Dermatitis

    4. Ben-beri

    • A
    • B
    • C
    • D
      • 3
      • 1
      • 2
      • 4
      • 2
      • 4
      • 1
      • 3
      • 2
      • 4
      • 3
      • 1
      • 3
      • 4
      • 2
      • 1
  7. Match List I with List II and select the correct answer

    List-I List-II
    1. Liver

    2. Beta cells

    3. Duodenum

    4. Parotid gland

    1. Amylase

    2. Chymotrypsin

    3. Insulin ZOOLOGY

    4. Stercobilin

    • A
    • B
    • C
    • D
      • 3
      • 4
      • 2
      • 1
      • 4
      • 3
      • 2
      • 1
      • 4
      • 3
      • 1
      • 2
      • 3
      • 4
      • 1
      • 2
  8. In Bohr effect, the oxygen equilibrium curve is influenced

    1. bt the partial pressure of oxygen whose increase shifts the curve to the right

    2. By a fall in temperature which shifts the curve to the left

    3. By Co2 whose increase shifts the curve to the right

    4. Neither by CO2 nor by temperature but only by O2 concentration which shifts the curve to the left

  9. When a nerve is stimulated, the outer surface of the axon gels negatively charged for a brief period. Its reversal is called:

    1. Action potential

    2. Repolarisation

    3. Resting potential

    4. Depolarization

  10. Match List-I (Contractile proteins) with List-II (Functions) and select the correct answer

    List-I List-II
    1. Myosin

    2. Actin

    3. Troponin

    4. Tropomyosin

    1. Interaction between actin and myosin

    2. Calcium binding

    3. Sliding

    4. AT Pose activity

    • A
    • B
    • C
    • D
      • 3
      • 4
      • 1
      • 2
      • 4
      • 3
      • 2
      • 1
      • 4
      • 3
      • 1
      • 2
      • 3
      • 4
      • 2
      • 1
  11. Which one of the following combinations of chromosome number (N) and DNA content (C) is true of the diplotene stage of a mammalian oocyte?

    1. 1N and 2C

    2. 2N and 4C

    3. 2N and 2C

    4. 1N and 4C

  12. Neoteny in Axolotlis the phenomenon where a larva

    1. Gains new tone in its body muscles

    2. Metamorphoses in a normal manner

    3. Becomes sexually mature and can reproduce but retains other systems in their larval state

    4. Permanently retains all its systems in their larval state without any exception

  13. Match List-I (Animals) with List-U (Larvae) and select the correct answer

    List-I List-II
    1. Polygordius

    2. Petromyzon

    3. Asterias

    4. Balanoglossus

    1. Ammocoetes

    2. Trochophore

    3. Tomaria

    4. Bipinnaria

    • A
    • B
    • C
    • D
      • 1
      • 2
      • 3
      • 4
      • 1
      • 2
      • 4
      • 3
      • 2
      • 1
      • 3
      • 4
      • 2
      • 1
      • 4
      • 3
  14. Which of the following pairs of germinal layers and organs is/are correctly matched?

      • Ectoderm
      • Eye
      • Endoderm
      • Heart
      • Mesoderm
      • Brain

    Which is correct

    1. 1, 2 and 3

    2. 1 alone

    3. 1 and 2

    4. 2 and 3

  15. Which of the following pairs of important characteristics and animals are correctly matched?

      • Gray crescent
      • Amphioxus
      • Yolk plug
      • Frog
      • Hesen's node
      • Chick

    Which is correct

    1. 1, 2 and 3

    2. 1 and 2

    3. 1 and 3

    4. 2 and 3

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