NEST: Zoology MCQs (Practice-Test 1 of 112)

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  1. The function of highly repeated satellite DNA sequence at the end of an eukaryotic chromosome is to protect the

    1. ends of chromosomes from being shortened during replication

    2. chromosomes from ionizing radiation

    3. chromosomes from random recombination

    4. chromosomes from incomplete separation during anaphase

  2. Bulk of the protein glycosylation takes place in

    1. Golgi complex

    2. peroxosomes

    3. ribosomes

    4. lysosomes

  3. Which one of the following enzymes is involved in packaging/supercoiling of DNA molecule?

    1. Topoisomerase

    2. Ligase

    3. a-polymerase

    4. Helicase

  4. During oxidative phosphorylation in mitochondria synthesis of ATP occurs due to

    1. oxidation of glucose by glycolysis

    2. electrochemical proton gradient

    3. oxidation of NADH to NAD +

    4. oxidation of pyruvate to acetyl CoA

  5. C-value paradox refers to the presence of

    1. more DNA than needed for coding

    2. less number of t-RNA than needed for polypeptide forma

    3. larger number of ribosomes than needed for polypeptide synthesis

    4. less number of RNA polymerases than needed for RNA synthesis

  6. How many types of t-RNA are found in an eukaryotic cell?

    1. 64-one each for genetic codon

    2. 20-one each for amino acids

    3. 03-related to protein synthesis

    4. 02-related to ribosomes and endoplasmic reticulum

  7. ‘Sex’ linked genes refer to genes

    1. present in a particular sex

    2. controlling secondary sexual characters

    3. controlling both primary and secondary sexual characters

    4. present on the sex chromosomes

  8. Insertion or deletion of a nucleotide in a class of mutation resulting in a sequence of codon that makes nonsensical polypeptide chain is called

    1. transversion

    2. inversion

    3. fame shift mutation

    4. lethal mutation

  9. Cancer causing genes are called

    1. operons

    2. oncogenes

    3. recons

    4. mutons

  10. Copper is associated with which one of the following mitochondrial enzymes?

    1. Cytochrome oxidase

    2. Syccinic dehydrogenase

    3. Catalase

    4. Acid phosphatase

  11. Two chromatin fibres per chromosome are present in

    1. G1

    2. cytokinesis

    3. telophase

    4. G2

  12. RNA molecules, capable of catalyzing a chemical reaction such as self-splicing, are known as

    1. isozymes

    2. ribosomes

    3. ribosomes

    4. lysosomes

  13. Mitotic chromosomes

    1. have high rate of protein synthesis

    2. have high rate of DNA synthesis

    3. show maximum chromosome condensation

    4. have homologous recombination

  14. ‘a’ is an autosomal gene and is responsible for albino character. A male rate, heterozygous for a, is crossed with a female rat of some genotype. How many of the F, offspring will express a phenotype (i.e.. Albino)?

    1. 100%

    2. 50%

    3. 25%

    4. None

  15. Trichocysts occur in

    1. hydrozoa

    2. porifera

    3. protozoa

    4. ctenophora