Biochemistry Questions and Answers – Sensory Transduction in Vision, Olfaction and Gustation

This set of Biochemistry MCQs focuses on “Sensory Transduction in Vision, Olfaction and Gustation”.

1. The G protein involved in visual signal transduction is _________
a) Rhodopsin
b) GTP receptor
c) Arrestin
d) Transducin
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2. Cholera toxin is not a/an _________
a) Enzyme inhibitor
b) Enzyme activator
c) Enzyme modifier
d) Toxin released from bacteria in the infected intestine
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3. In cholera there is uncontrolled secretion of _________
a) Na⁺ and H₂O
b) K⁺ and H₂O
c) Ca⁺² and H₂O
d) Mg⁺² and H₂O
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4. Vision, olfaction and gustation employ _________
a) Serpentine receptors
b) Enzyme coupled receptors
c) Ligand gated receptors
d) Adhesion receptors
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5. Which out of the following statements about sense of smell is not true?
a) Olfactory receptor cells are bipolar neurons, not replaced when damaged
b) The chemicals are received by specific plasma membrane receptors in olfactory receptor cells
c) Olfactory receptors do not adapt quickly
d) The main areas of brain that interpret sense of smell be in the temporal and frontal lobes
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6. Most olfactory receptors are located on the _________
a) Superior surface of nasal cavity
b) Interior surface of nasal cavity
c) Lateral surface of nasal cavity
d) Medial surface of nasal cavity
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7. Objects are perceived by photo receptors because rods or cones
a) Depolarize
b) Hyperpolarize
c) Repolarize
d) Polarize
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8. Which of the following statements is not true about olfactory neurons?
a) Axons of olfactory neurons combine to form olfactory nerves
b) They synapse with cells in olfactory bulb
c) They have receptors that react with odorants dissolved in fluid
d) They are uni-polar neurons
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9. What is the relationship between olfactory sensors and gustatory sensors?
a) Gustatory hair can also detect odorants
b) Olfactory hair can also detect tastants
c) Olfactory sensors provides information about substance that we are about to taste
d) No relation
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10. When visual stimulus reaches receptors in retina of eye, first process involving absorption of physical energy by receptors is?
a) Reception
b) Transduction
c) Coding
d) Adaptation
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11. When visual stimulus reaches receptors in retina of eye, second process involving absorption of physical energy by receptors is?
a) Reception
b) Transduction
c) Coding
d) Adaptation
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Sanfoundry Global Education & Learning Series – Biochemistry.

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