Competitive Exams: Zoology MCQs (Practice-Test 46 of 112)

  1. Consider the following statements regarding the structure of DNA

    1. There are three hydrogen bonds between adenine and thymine whereas between cytosine and guanine the hydrogen bonds are two.

    2. Irrespective of the source of DNA, the ratio of adenine to thymine and the ratio of cytosine to guanine is always one.

    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

  2. In DNA, the deoxygenation is at

    1. first carbon atom

    2. second carbon atom

    3. third carbon atom

    4. fourth carbon atom

  3. Consider the following statements:

    1. In a bacterial ribosome, the 30S subunit contains one molecule of rRNA and the large subunit contains two molecules each of three types of rRNA.

    2. All tRNAs have five loops caused by complementary base pairing and the anticodon is at the third loop from the 5' end.

    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. An antibiotic that resembles the 3' end of a charged tRNA molecule and brings premature termination of protein synthesis is

    1. streptomycin

    2. chloramphenicol

    3. tetracycline

    4. purornycin

  5. The interspecific interaction between the termites and the protozoans (Trichonympha sp.), present in the guts of termites is called

    1. Amensalism

    2. Commensalism

    3. Parasitism

    4. Mutualism

  6. Similarity in the appearance of two or more unpalatable species resulting over evolutionary time is called

    1. Mutual adaptation

    2. Batesian mimicry

    3. Mullerian mimicry

    4. Convergent mimicry

  7. The pyramids of biomass are always inverted in

    1. grassland ecosystem

    2. forest ecosystem

    3. pond ecosystem

    4. desert ecosystem

  8. Consider the following:

    1. Bandipur Wildlife Sanctuary

    2. Manas Wildlife Sanctuary

    3. Simlipal Wildlife Sanctuary

    Which of the above are tiger reserves under the Project Tiger?

    1. 1 and 2 only

    2. 2 and 3 only

    3. 1 and 3 only

    4. 1, 2 and 3

  9. Thamin deer (Cervus eldi) is an inhabitant of

    1. Kanha National Park

    2. Keibul Lamjao National Park

    3. Bandipur Wildlife Sanctuary

    4. Periyar Wildlife Sanctuary

  10. Consider the following statements:

    1. The king cobra is ophiophagus.

    2. The king cobra is the only snake in the world which builds a nest.

    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

  11. Which one of the following refers to the largest tiger reserve?

    1. Corbett

    2. Sanska

    3. Nagarjunasagar-Srisailam

    4. Kanha

  12. Consider the following statements:

    1. In India, the Sangai is confined to Nagaland only.

    2. Four-horned antelope (Tetracerus quadricornis) exclusively live in Indian sub-continent.

    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

  13. Who discovered Polymerase Chain Reaction (PCR)?

    1. James Watson

    2. David Baltimore

    3. Kary Mullis

    4. F. Crick

  14. Consider the following statements:

    1. Marfan syndrome is a sexlinked disorder.

    2. Phenylketonuna is an autosomal disorder.

    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. Which one of the following conditions differentiates eukaryotic DNA replication from prokaryotic DNA replication?

    1. Bidirectional replication fork

    2. No use of an RNA primer

    3. Multiple origins of replication

    4. Use of only one DNA polymerase