Which of the following is a function of membrane p

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Question 1 of 5

Which of the following is a function of membrane proteins?

A. to process lipids and proteins for secretion through the plasma membrane B. to act as receptors for hormones C. to synthesise proteins from amino acids D. to act as a cytoskeleton to support and shape the cell

Correct Answer: B

Rationale: One function of membrane proteins is to receive(amino acid based) hormones that cannot pass through the plasma membrane.

Question 2 of 5

What is the name of the membrane that surrounds the lungs?

A. visceral peritoneum B. parietal peritoneum C. visceral pleura D. dura mater

Correct Answer: C

Rationale: Pleura is around the lung, while visceral refers to the layer of the pleura that is attached to the lung surface.

Question 3 of 5

Facilitated diffusion refers to the process of

A. movement along a concentration gradient assisted by protein carrier molecules. B. movement of ions and molecules along a concentration gradient. C. transport of molecules and ions against their concentration gradient. D. water movement through a semi-permeable membrane

Correct Answer: A

Rationale: Facilitated refers to the role of the protein carriers. The other choices refer to diffusion, active transport and osmosis respectively

Question 4 of 5

The process of "active transport" through a membrane may be described by which of the following?

A. the movement of ions and small molecules away from regions where they are in high concentration. B. the use of energy from ATP to move ions and small molecules into regions where they are in lower concentration. C. the plasma membrane engulfs the substance and moves it through the membrane. D. the use of energy from ATP to move ions and small molecules against their concentration gradient.

Correct Answer: D

Rationale: Energy(ATP) is required to force molecules against their concentration gradient.

Question 5 of 5

One of the functions of integral proteins in cell membranes is to:

A. maintain the rigid structure of the cell B. support mechanically the phospholipids C. interact with the cytoplasm D. form channels for transport functions

Correct Answer: D

Rationale: Some proteins form channels which allow molecules and ions to enter the cell.

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Which of the following is a function of membrane proteins?

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