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MCQs

Total Questions : 101 | Page 9 of 11 pages
Question 81. Which of the following is not a downstream component?
  1.    Ras
  2.    MEK
  3.    ERK
  4.    PIP3
 Discuss Question
Answer: Option D. -> PIP3
Answer: (d).PIP3
Question 82. The G protein involved in visual signal transduction is _________
  1.    Rhodopsin
  2.    GTP receptor
  3.    Arrestin
  4.    Transducin
 Discuss Question
Answer: Option C. -> Arrestin
Answer: (c).Arrestin
Question 83. In cholera there is uncontrolled secretion of _________
  1.    Na⁺ and H₂O
  2.    K⁺ and H₂O
  3.    Ca⁺² and H₂O
  4.    Mg⁺² and H₂O
 Discuss Question
Answer: Option A. -> Na⁺ and H₂O
Answer: (a).Na⁺ and H₂O
Question 84. Vision, olfaction and gustation employ _________
  1.    Serpentine receptors
  2.    Enzyme coupled receptors
  3.    Ligand gated receptors
  4.    Adhesion receptors
 Discuss Question
Answer: Option A. -> Serpentine receptors
Answer: (a).Serpentine receptors
Question 85. Cholera toxin is not a/an _________
  1.    Enzyme inhibitor
  2.    Enzyme activator
  3.    Enzyme modifier
  4.    Toxin released from bacteria in the infected intestine
 Discuss Question
Answer: Option B. -> Enzyme activator
Answer: (b).Enzyme activator
Question 86. Which out of the following statements about sense of smell is not true?
  1.    Olfactory receptor cells are bipolar neurons, not replaced when damaged
  2.    The chemicals are received by specific plasma membrane receptors in olfactory receptor cells
  3.    Olfactory receptors do not adapt quickly
  4.    The main areas of brain that interpret sense of smell be in the temporal and frontal lobes
 Discuss Question
Answer: Option C. -> Olfactory receptors do not adapt quickly
Answer: (c).Olfactory receptors do not adapt quickly
Question 87. Most olfactory receptors are located on the _________
  1.    Superior surface of nasal cavity
  2.    Interior surface of nasal cavity
  3.    Lateral surface of nasal cavity
  4.    Medial surface of nasal cavity
 Discuss Question
Answer: Option A. -> Superior surface of nasal cavity
Answer: (a).Superior surface of nasal cavity
Question 88. Objects are perceived by photo receptors because rods or cones
  1.    Depolarize
  2.    Hyperpolarize
  3.    Repolarize
  4.    Polarize
 Discuss Question
Answer: Option B. -> Hyperpolarize
Answer: (b).Hyperpolarize
Question 89. When visual stimulus reaches receptors in retina of eye, first process involving absorption of physical energy by receptors is?
  1.    Reception
  2.    Transduction
  3.    Coding
  4.    Adaptation
 Discuss Question
Answer: Option A. -> Reception
Answer: (a).Reception
Question 90. Which of the following statements is not true about olfactory neurons?
  1.    Axons of olfactory neurons combine to form olfactory nerves
  2.    They synapse with cells in olfactory bulb
  3.    They have receptors that react with odorants dissolved in fluid
  4.    They are uni-polar neurons
 Discuss Question
Answer: Option D. -> They are uni-polar neurons
Answer: (d).They are uni-polar neurons

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