Competitive Exams: Zoology MCQs (Practice-Test 24 of 112)

  1. What is the correct sequence of electron transport in a respiratory chain?

    1. Ubiquinone-Flavoprotein-NADH-Cytochrome a-Cytochrome b-Cytochrome c-Cytochrome c1

    2. NADH-Flavoprotein-Ubiquinone-Cytochrome b-Cytochrome c1-Cytochrome c-Cytochrome a

    3. Flavoprotein-NADH-Ubiquinone-Cytochrome a-Cytochrome c-Cytochrome c1 − k Cytochrome b

    4. NADH-Ubiquinone-Flavoprotein-Cytochrome c-Cytochrome c1-Cytochrome b-Cytochrome a

  2. Mixture of oil in water forms an emulsion. If a protein is shaken up with such an emulsion

    1. protein molecules settle down

    2. coalescence of oil particles takes place

    3. a thin film of protein molecules is formed on the surface

    4. the emulsion gets stabilised

  3. Nissle granules in a nerve cell are now identified as

    1. ribosomes

    2. rough endoplasmic reticulum

    3. mitochondria

    4. lysosomes

  4. Among which one of the following groups of chemicals, all are neurotransmitters?

    1. Somatostatin, serotonin, acetylcholine

    2. Non-adrenaline, somatostatin, threonine

    3. Glycine, dopamine, melatonin

    4. Acetylcholine, non-adrenaline, dopamine

  5. Profound confusion, memory loss and changes in per-sonality are some of the symptoms of

    1. Parkinson's disease

    2. Alzheimer's disease

    3. Schizophrenia

    4. Progeria

  6. Physiologically vitamin E is known to be

    1. anti-inflammatory

    2. a power antioxidant

    3. an important co-enzyme

    4. anti-hypertensive factor

  7. The enzymatic reaction for which thiamin pyrophosphate functions as a cofactor is

    1. fixation of carbon dioxide

    2. peptide bond formation

    3. phosphate group transfer

    4. decarboxylation of a-keto acids

  8. Which one of the following compounds is NOT a constituent of the electron transport system?

    1. Carnitine

    2. Cytochrome c

    3. Nicotinamide adenine dinucleotide

    4. Ubiquinone

  9. Cyclic AMP (cAMP) is degraded to AMP by an enzyme called

    1. restriction endonuclease

    2. adenyl cyclase

    3. phosphodiesterase

    4. ATPase

  10. At the completion of glycolytic process the products formed are

    1. two pyruvic acid molecules

    2. two lactic acid molecules

    3. one molecule each of lactic acid and ethanol

    4. two acetyl coenzyme molecules

  11. Which one of the following glycolytic enzymes is inhibited by fluoride?

    1. Lacate dehydrogenase

    2. Pyruvate kinase

    3. Enolase

    4. Hexokinase

  12. What is true about sweat glands in humans?

    1. Sweat glands are intimately associated with hair follicles

    2. There are emergency excretory structures to give out urea

    3. Human races inhabiting arctic regions, such as Eskimos have the least number of sweat pores per unit area of the skin

    4. Their secretion makes the skin waterproof and making it unsuitable for the microorganisms to settle on it

  13. Consider the following statements: In citric acid cycle

    1. three hydride ions (hence, six electrons) are transformed to 3 NAD + molecules

    2. one pair of hydrogen atoms (hence, two electrons) are transferred to one NADP + molecule

    3. one pair of hydrogen atoms (hence, two electrons) are transferred to a FAD molecule

    4. one NADH molecule is utilized in the process

    Which of the above statements are correct?

    1. 1 and 2

    2. 1 and 3

    3. 2 and 4

    4. 1, 3 and 4

  14. Free energy liberated during oxidation per mole of palmitic acid. Is? G (cal/mole)

    1. -4600

    2. -326, 000

    3. -686, 000

    4. -2, 338, 00

  15. Cholecystokinin stimulates secretion of:

    1. bile juice

    2. pancreatic juice rich in digestive enzymes

    3. pancreatic juice rich in sodium bicarbonate

    4. glucagon from endocrine pancreas