Competitive Exams: Zoology MCQs (Practice-Test 59 of 112)

  1. What is the initiation codon in transcription?

    1. UGA

    2. UAG

    3. UAA

    4. AUG

  2. The structure of which one of the following inhibitors of protein synthesis is very similar to 3' end of an aminoacyl tRNA?

    1. Chloramphenicol

    2. Cycloheximide

    3. Puromycin

    4. Streptomycin

  3. Consider the following statements:

    1. The myelin sheath of neurons is an extended plasma membrane which contains more protein than lipid (in mass per total mass)

    2. The membranes of mitochondria contain more lipid than protein (in mass per total mass)

    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

  4. Consider the following statements:

    1. The nucleolus is inconspicuous/absent in sperm and muscle fibers.

    2. The membranes of smooth endoplasmic reticulum contain enzymes that are involved in the synthesis of sterols and triglycerides.

    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

  5. In the typical eukaryotic cell cycle, which one of the following phases is shortest?

    1. G 1 phase

    2. G 2 phase

    3. M phase

    4. S phase

  6. Which one of the following statements is not correct?

    1. Animal cells generally have fewer mitochondria, as compared to plant cells.

    2. The inner membrane of mitochondrion is selectively permeable.

    3. Mitochondrial DNA is circular.

    4. Mitochondrial DNA codes for intrinsic ribosomal RNA, transfer RNA and ribosomal proteins.

  7. Consider the following statements:

    1. Lysosomes essentially contain oxidases whereas peroxisomes essentially contain hydrolases.

    2. Lysosomes are formed by budding off from the smooth endoplasmic reticulum whereas peroxisomes are formed by budding off from Golgi apparatus.

    Which of the statements given above is/are correct?

    1. 1 only

    2. 1 only

    3. Both 1 and 2

    4. Neither 1 nor 2

  8. In the context of mutations in genetic material, which one of the following is an intercalating agent?

    1. Colchicine

    2. Ethidium bromide

    3. 5-bromouracil

    4. Rifampicin

  9. With reference to Himalayan wild goats, Consider the following statements:

    1. The ibex lives in Himalayas above the tree line and below the snow line.

    2. The markhor can climb a tree to browse its leaves.

    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

  10. Match List-I with List-II and select the correct answer using the code given below the lists:

    List-I (Species) List-II (Natural habitat)
    1. Ailurus fulgens

    2. Felis libyca

    3. Loris tardigradus

    4. Equus hemionus kiang

    1. Semi-arid areas surrounding Thar desert

    2. Eastern Himalayas

    3. Dense forests of South India

    4. Ladakh and Spiti areas of Western Himalayas

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

      • Mudumalai Wildlife Sanctuary
      • Mouse deer
      • Dibru Saikhowa Wildlife Sanctuary
      • Swamp deer
      • Nagarjunasagar Srisailam Wildlife Sanctuary
      • Indian Pangolin

    Which of the pairs given above is/are correctly matched?

    1. 1 and 2 only

    2. 2 only

    3. 3 only

    4. 1, 2 and 3

  12. Consider the following statements:

    1. Prosthetic groups in enzymes function as electron acceptors.

    2. Prosthetic groups bind to the enzyme always by ionic bonds.

    Which of the statements given above is/are correct?

    1. 1only

    2. 2 only

    3. Both 1 and 2

    4. Neither 1 nor 2

  13. Match List-I with List-II and select the correct answer using the code given below the lists:

    List-I (Insects) List-II (Order)
    1. Bees

    2. Butterflies

    3. Houseflies

    4. Termites

    1. Diptera

    2. Hymenoptera

    3. Isoptera

    4. Lepidoptera

    • A
    • B
    • C
    • D
      • 3
      • 4
      • 1
      • 2
      • 2
      • 1
      • 4
      • 3
      • 3
      • 1
      • 4
      • 2
      • 2
      • 4
      • 1
      • 3
  14. With reference to a termite colony, consider the following statements:

    1. The soldiers are all male and winged.

    2. The workers are both male and female with no wings.

    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

  15. Match List-I with List-II and select the correct answer using the code given below the lists:

    List-I (Order) List-II (Example)
    1. Beloniformes

    2. Cypriniformes

    3. Perciformes

    4. Syngnathiformes

    1. Anabas

    2. Catla

    3. Exocoetus

    4. Hippocampus

    • A
    • B
    • C
    • D
      • 4
      • 1
      • 2
      • 3
      • 4
      • 2
      • 1
      • 3
      • 3
      • 2
      • 1
      • 4
      • 3
      • 1
      • 2
      • 4
  16. In the induced breeding technique in fishes, the extract of which one of the following is used?

    1. Gonads

    2. Pancreas

    3. Pituitary

    4. Thyroid

  17. Which of the following is used in preparing ‘Is in Glass’

    1. Scales of fishes

    2. Shell of oysters

    3. Air bladder of fishes

    4. ‘Cuttle bone’ of cephalopods

  18. Consider the following features of animals:

    1. There is no pectoral girdle

    2. The urinary bladder is absent

    3. The brain case is closed anteriorly

    Which of the above anatomical feature/features distinguish/distinguishes snakes from lizards?

    1. 1 only

    2. 1 and 2 only

    3. 2 and 3 only

    4. 1, 2 and 3

  19. Which one of the following snakes is viviparous?

    1. Bungarus coeruleus

    2. Python molurus

    3. Vipera russeli

    4. Zamenis mucosus

  20. Consider the following species of Silkworms:

    1. Antheraea assama

    2. Attacus ricini

    3. Bombyx mori

    Which of the above belongs/belong to the family Saturniidae?

    1. 1 and 2 only

    2. 2 only

    3. 1 and 3 only

    4. 1, 2 and 3

  21. Down's syndrome is caused by an extra:

    1. 11th chromosome

    2. 18th chromosome

    3. 21st chromosome

    4. 22nd chromosome

  22. With reference to human genetic disorders affecting amino acid catabolism, which one of the following pairs is not correctly matched? Condition Defective enzyme

      • Albinism
      • Tyrosine 3-monoxygenase
      • Alkaptonuria
      • Homogentisate 1, 2-dioxygenase
      • Maple syrup urine disease
      • Branched chain a-Keto acid dehydrogenase complex
      • Phenylketonuria
      • Methylmalonyl CoA mutase
    • Assertion (A): In electron transfer reaction in mitochondria, the energy for ATP synthesis is provided by the proton-motive force that drives protons back from intermembrane space into the matrix.
    • Reason (R): The inner mitochondrial membrane is permeable to protons.
    1. Both A and R are individually true and R is the correct explanation of A

    2. Both A and R are individually true but R is not the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): Morgan's cross between white eyed male fruit flies and wild type females is an example of a test-cross.
    • Reason (R): The standard test-cross is between a homozygous recessive organism and the one displaying the dominant phenotype.
    1. Both A and R are individually true and R is the correct explanation of A

    2. Both A and R are individually true but R is not the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): Entamoeba coil is an endocommensal.
    • Reason (R): It lives in the lumen of the ileum of humans.
    1. Both A and R are individually true and R is the correct explanation of A

    2. Both A and R are individually true but R is not the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): The body wall of leech has respiratory function.
    • Reason (R): The parapodia have rich blood supply and gaseous exchange takes place at their surface.
    1. Both A and R are individually true and R is the correct explanation of A

    2. Both A and R are individually true but R is not the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): During the cleavage in the zygote of frog, micromeres divide more rapidly than megameres.
    • Reason (R): The yolk hinders the division of megameres.
    1. Both A and R are individually true and R is the correct explanation of A

    2. Both A and R are individually true but R is not the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): In Hydra, nematocysts are produced only on the stomach and get transferred to their ultimate positions.
    • Reason (R): Nematocysts are living cells modified to perform a special function.
    1. Both A and R are individually true and R is the correct explanation of A

    2. Both A and R are individually true but R is not the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): The destruction of forests by acid precipitation or other activities will result in major perturbations of the nitrogen cycle.
    • Reason (R): Forests are a major nitrogencontaining component of the biosphere.
    1. Both A and R are individually true and R is the correct explanation of A

    2. Both A and R are individually true but R is not the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): The concentration of oxygen within Amoeba always remains higher than that in outside water.
    • Reason (R): The oxygen dissolved in the surrounding water passes into the cytoplasm of Amoeba by diffusion.
    1. Both A and R are individually true and R is the correct explanation of A

    2. Both A and R are individually true but R is not the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true