Competitive Exams: Zoology MCQs (Practice-Test 43 of 112)

    • Assertion (A): During protein synthesis, peptide bond formation is a dehydration reaction.
    • Reason (R): Peptide bond formation is done by sharing of electrons between a carboxyl carbon of one amino acid and an amino nitrogen of another amino acid.
    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 citric acid cycle, when succinate is oxidised to fumarate, a molecule of carbon dioxide is lost.
    • Reason (R): When succinate is oxidised to fumarate, electrons and protons are passed to FAD reducing it to FADH2.
    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): Before the origin of life, the atmosphere on earth was reducing in nature.
    • Reason (R): There was a great deal of volcanic activity at that time.
    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): RNA polymerases can synthesize RNA molecules from DNA template in both 5 − 3 ‘and 3 − 5’ directions.
    • Reason (R): RNA polymerases can slide in either direction along a DNA template.
    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 Sycon (Scypha), only self-fertilization occurs.
    • Reason (R): In Sycon, special sex organs are lacking.
    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 prokaryotes, the translation begins on mRNA before transcription is completed.
    • Reason (R): The triplet codons in prokaryotic mRNA are transcribed from the sense strand of DNA and subsequently are translated continuously from 3-OH end to the 5-PO4 end.
    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

  1. What is the role of secretin from the following?

    1. It stimulates the testis to secrete testosterone

    2. It stimulates stomach to release HCl

    3. It stimulates pancreas to secrete the digestive enzymes

    4. It stimulates spleen to release the stored RBC

  2. The synthesis of plasma albumin in done by

    1. liver

    2. muscle cells

    3. pancreas

    4. spleen

  3. Consider the following statements:

    1. The females, but not males, of all wasps have sting.

    2. The adult wasps have shorter tongue than bees, and so can suck the nectar only from shallow flowers.

    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. ‘Bombay duck’ is the common name of which one of the following commercial fish?

    1. Hilsa ilisha

    2. Harpodon nehereus

    3. Chanos chanos

    4. Lates calcarifer

  5. Match List-I (Disease) with List-II (Insect Vecto) and select the correct answer using the code given below the lists

    List-I List-II
    1. Dengue

    2. Trypanosomiasis

    3. Bubonic plague

    4. Trench fever

    1. Glassina palpalis

    2. Aedes sp

    3. Pediculus humanus

    4. Xenopsylla cheopis

    • A
    • B
    • C
    • D
      • 2
      • 1
      • 4
      • 3
      • 2
      • 4
      • 1
      • 3
      • 3
      • 1
      • 4
      • 2
      • 3
      • 4
      • 1
      • 2
  6. Venomous snakes with grooved fangs belong to the group

    1. Proteroglypha

    2. Solenoglypha

    3. Hologlypha

    4. Opisthoglypha

  7. Consider the following characteristics of snakes:

    1. Flat tail

    2. Belly covered with uniform small scales continuouswith dorsals

    3. Loreal pit present between eye and nostril

    Which of the above is/are the characteristics (s) of poisonous snakes?

    1. 1 and 2 only

    2. 1 and 3 only

    3. 3 only

    4. 1, 2 and 3

  8. Consider the following statements:

    1. Adult rohu (Labeo rohita) is a herbivorous fish.

    2. Anabas (Anabas testudineus). is a carnivorous fish.

    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

  9. Duchenne muscular dystrophy is a/an

    1. sex-linked disorder

    2. autosomal disorder

    3. pre-disposition to multiple cancer

    4. trinucleotide repeat expansion