Which of the following statements about the figure shown below is true? A) 1 is

Question

Which of the following statements about the figure shown below is true? A) 1 is a homotetrameric protein. B) 2 is found on the extracellular side of the plasma membrane. C) 1 and 2 are both signal transduction protein. D) Fe is the signaling molecule recognized by 2. E) None of the above. Which of the following statements about gated ion channels is false? A) They transport ions across the cell membrane. B) All gated ion channels respond to changes the membrane potential. C) Voltage-gated sodium channel is a gated ion channel. D) Nicotinic acetylcholine receptor is a gated ion channel. E) None of the above. What is the function of the Na^+ K^+ ATPase shown in the figure below? A) It transports three sodium ions out of the cell and two potassium ions into the cell. B) It transports three sodium ions into the cell and two potassium ions out of the cell. C) It transports three potassium ions out of the cell and two sodium ions into the cell. D) It transports three

Explanation / Answer

44.

1 is a homodimeric protein and 2 is present inside the cytoplasm.

Fe is the cofactor in 2. So, A, B and D are wrong.

1 is a receptor and 2 is an effector/transducer molecule in a signaling cascade. So, option C is correct.

45.

All gated ion channels respond to changes in the membrane potential and they transport ions across the membrane.

Both, sodium channel and nicotinic acetyl choline receptor are gated ion channels.

So, option E is correct.

46.

Na+-K+ ATPase pump exports Na+ ions out of the cell while importing K+ ions into the cell, both against their concentration gradients in an active process.

Na+-K+ ATPase exports three sodium ions out of the cell for the import of every two potassium ions into the cell.

So, option A is correct.

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