Competitive Exams: Zoology MCQs (Practice-Test 47 of 112)

  1. Restriction-modification system of bacteria exists to

    1. promote conjugation

    2. encourage recombination of new genetic material

    3. promote complementation

    4. protect bacteria from invading foreign

    DNA

  2. With reference to the enzymes in mitochondria, match List-I (Location in Mitochondria) with List-II (Enzymes) and select the correct answer using the code given below the Lists

    List-I List-II
    1. Outer membrane

    2. Inner membrane

    3. Inter-membranal space

    4. Matrix

    1. Adenylate kinase

    2. Fatty acid CoA ligase

    3. Malate dehydrogenase

    4. Succinic acid dehydrogense

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

    1. ATPase

    2. Add phosphatase

    3. Glucose-6-phosphatase

    Which of the above enzymes is/are present in the Golgi complex of animal cells?

    1. 1 only

    2. 2 and 3 only

    3. 1 and 3 only

    4. 1, 2 and 3

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

    1. In deoxyribose, the phosphate is attached to 3, carbon and the hydroxyl group is attached to 5' carbon

    2. Any nucleic add has a 3 ‘end and a 5’ end

    3. A gene is always written from 5' end

    4. The length of the promoter sequence varies from gene to gene

  5. A sequence of nucleotides on DNA ‘CATCATCATCAT’ is changed through mutation to ‘CAATCATCATCAT’ What is this type of mutation called?

    1. Frame shift

    2. Transition

    3. Transversion

    4. Nonsense

  6. Consider the following statements:

    1. Histones are found in all organisms that have nuclei.

    2. There are eleven types of histones.

    3. Histones are removed temporarily during transcription.

    4. Any change in the amino acid sequence of histone proteins is harmless for the organism.

    Which of the statements given above is/are correct

    1. 1 only

    2. 2, 3 and 4 only

    3. 1 and 3 only

    4. 1, 3 and 4 only

  7. As an antibiotic inhibiting protein synthesis, what is the specific action of Rifamycin?

    1. Inhibition of elongation at transcription in eukaryotes

    2. Denaturing RNA polymerase thereby blocking initiation at transcription in prokaryotes

    3. Inhibition of recognition on mRNA in both prokaryotes and eukaryotes

    4. Blocking binding at A-site or causing misreading of codon in prokaryotes

  8. Which among the following are the precursor amino acids for purines?

    1. Arginine and Tyrosine

    2. Aspartate and Glycine

    3. Histidine and Tyrosine

    4. Methionine and Tryptophan

  9. Bacterial cells can be rendered more permeable to the uptake of plasmids by treatment with

    1. heat

    2. calcium, phosphate

    3. alkali detergent

    4. ultrasound or magnetism

  10. Which one of the following human genes has the longest stretch of DNA (~24 Mb)?

    1. Globin gene

    2. Histone gene

    3. Dystrophin gene

    4. Insulin gene

  11. Consider the following statements:

    1. Chloramphenicol does not. Affect mitochondrial protein synthesis.

    2. Mitochondria employ f-methionine as the initiating amino acid.

    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

  12. Which one of the following cells is diploid?

    1. Primary polar body

    2. Spermatid

    3. Primary spermatocyte

    4. Spermatozoon

  13. Consider the following statements: A mammalian protein expressed in E. Coil by means of recombinant DNA technology can lack

    1. glycosylation

    2. phosphorylation

    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

  14. Hormones are thought to regulate gene activity primarily at the level of

    1. transport of RNA from nucleus to cytoplasm

    2. post-translation processing of protein

    3. transcription

    4. translation

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

    List-I List-II
    1. Solenocytes

    2. Columella auris

    3. Membrane of Reissner

    4. Crypts of Lieberkuhn

    1. Calotes

    2. Oryctolagus

    3. Amphioxus

    4. Columba

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