Competitive Exams: Zoology MCQs (Practice-Test 29 of 112)

  1. Which one of the following groups of terms describes nucleosome?

    1. m-RNA, rRNA, t-RNA

    2. 40 S, 60 S, 80 S

    3. Histones, 200 bp-DNA, linker DNA

    4. r-DNA, rRNA, nucleolus

  2. Which one of the following is the predominant DNA type in an animal's cell?

    1. B-DNA

    2. C-DNA

    3. S-DNA

    4. Z-DNA

  3. Balbiani ring is. a site of

    1. gene amplification

    2. active protein synthesis

    3. active m-RNA synthesis

    4. ribosomal RNA genes

  4. In the 1940s, Barbara McClintock described ‘jumping genes’ in maize. Such mobile segments of DNA, now called transposons can insert themselves

    1. into plasmid DNA

    2. only in DNA molecules where there are complementary base pairs

    3. into virtually any part of any DNA molecule

    4. only in repetitive DNA

  5. First meiotic division causes formation of haploid cells, but the second equational division of meiosis is necessary for

    1. the segregation of replicated chromosomes

    2. equal distribution of haploid chromosomes

    3. the formation of four gametes

    4. The equal distribution of genes on chromosomes

  6. The enzymes that control the attachment of amino acids with t-RNA are

    1. Synthetases

    2. Transferases

    3. Isomerases

    4. Dehydrogenases

  7. Carbon dioxide increases (H + ) of the body fluids through the formation of

    1. lactic acid

    2. acetic acid

    3. HCO3-

    4. H2CO3

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

      • Man
      • Haemochorial placenta
      • Pig
      • Syndesmochorial placenta
      • Rabbit
      • Epitheliochorial placenta
      • Sheep
      • Haemoendotheliochorial placenta
  9. Zonar type of placenta is exemplified by

    1. Rat, guinea-pig, horse

    2. Dog, cat, tiger

    3. Rat, horse, tiger

    4. Guinea-pig, dog, cat

  10. Glossina (tse-tse fly) transmits the infective stages of

    1. Plasmodium falciparum

    2. Wuchereria bancrofti

    3. Trypanosoma gambiense

    4. Leishmania donovani

  11. The commercial production of cochineal dye is done from

    1. dead and dried bodies of Dactylopis coccus

    2. live adults of Dactylopis coccus

    3. live larval stages of Dactylopis coccus

    4. live adults of D. Coccus and the plant on which they live

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

    List-I (Snakes) List-II (Characteristic features)
    1. Cobra

    2. Krait

    3. Russell's Viper

    4. Rat snake

    1. Head covered with scales and not shields, no loreal pit, sub-caudals double, fangs tubular

    2. Ventrals extend across the belly, tail cylindrical and pointed, all maxillary teeth solid, none grooved or tubular

    3. Vetrebrals not enlarged, third supralabial touches the nasal shield and eye, fangs grooved

    4. Vertebrals enlarged, only four infralabials present, the last being the largest, fangs grooved

    • A
    • B
    • C
    • D
      • 3
      • 4
      • 1
      • 2
      • 1
      • 2
      • 3
      • 4
      • 3
      • 2
      • 1
      • 4
      • 1
      • 4
      • 3
      • 2
  13. Which one of the following wasps is found hovering over the beehives?

    1. Vespa magnifica

    2. Vespa orientalis

    3. Polistes herbraeus

    4. Polistes indica

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

    List-I (Number of observable Barr bodies) List-II (Human sex chromosomes)
    1. Barr Bodies 0

    2. Barr Bodies 1

    3. Barr Bodies 2

    4. Barr Bodies 3

    1. XXX

    2. XYY

    3. XXXX

    4. XXYY

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

    List-I (Human genetic disorder) List-II (Type of disorder)
    1. Albinism

    2. Duchenne

    3. dystrophy

    4. muscular

    1. Autosomal dominant

    2. Autosomal recessive

    3. X-linked

    4. Y-linked

    • A
    • B
    • C
    • D
      • 3
      • 1
      • 4
      • 2
      • 2
      • 4
      • 1
      • 3
      • 3
      • 4
      • 1
      • 2
      • 2
      • 1
      • 4
      • 3