Questions and answers for exam Preparation

MCQs

Total Questions : 101 | Page 7 of 11 pages

Question 61. Receptor is removed from cell surface in _____________

Specificity
Amplification
Adaptation
Integration

Discuss Question

Answer: Option C. -> Adaptation
Answer: (c).Adaptation

Question 62. Voltage regulation means ____________

Na⁺/K⁺ pumps controls potential
Unless the voltage is regular gates will not respond
Oscilloscope only can control potential
With changes in the membrane potential voltage gated ion channels open and close

Discuss Question

Answer: Option D. -> With changes in the membrane potential voltage gated ion channels open and close
Answer: (d).With changes in the membrane potential voltage gated ion channels open and close

Question 63. Depolarization and repolarization changes that occur during the action potential are produced by ____________

Negative feedback loops
Carrier mediated transport
Simple diffusion of ions down their concentration gradient
Active transport pumps along the neuron membrane

Discuss Question

Answer: Option D. -> Active transport pumps along the neuron membrane
Answer: (d).Active transport pumps along the neuron membrane

Question 64. Diffusion of K⁺ out of the cell makes the inside of it less positive, or more negative and acts to restore the original resting membrane potential. This process is called ____________

Repolarization
Depolarization
Hyperpolarization
Overshoot

Discuss Question

Answer: Option A. -> Repolarization
Answer: (a).Repolarization

Question 65. Which of the following statements about action potential is false?

Na⁺/K⁺ pumps are directly involved in creating the action potential
Na⁺ and K⁺ concentrations are not significantly changed during an action potential
This includes both positive and negative feedback loops
Only a relatively small number of Na⁺ and K⁺ actually diffuse across the membrane

Discuss Question

Answer: Option B. -> Na⁺ and K⁺ concentrations are not significantly changed during an action potential
Answer: (b).Na⁺ and K⁺ concentrations are not significantly changed during an action potential

Question 66. Which out of the following is not a neurotransmitter?

Noadrenaline
Cyclic AMP
Dopamine
Acetyl choline

Discuss Question

Answer: Option B. -> Cyclic AMP
Answer: (b).Cyclic AMP

Question 67. Which out of the following statements is true about G-protein couple receptors?

The N-terminal chain is extracellular and C-terminal chain is intracellular
It contains 5 trans-membrane hydrophobic sections
There are more extracellular loops than intracellular loops
The binding region for G-protein involves 2 extracellular loops

Discuss Question

Answer: Option A. -> The N-terminal chain is extracellular and C-terminal chain is intracellular
Answer: (a).The N-terminal chain is extracellular and C-terminal chain is intracellular

Question 68. Protein kinase A is ____________