Membrane Structure and Functions – Section 1

1. Cholesterol is somewhat amphipathic due to

A. the single hydroxyl along with the hydrocarbon nature of the remainder of the molecule
B. the long branched hydrocarbon along with the four hydrocarbon rings
C. the five-methyl groups along with the hydrocarbon chain
D. the three six-membered rings along with the single five-membered ring

Correct Answer: A. the single hydroxyl along with the hydrocarbon nature of the remainder of the molecule

2. Bacteriorhodopsin

A. absorbs light and pumps protons
B. is an integral membrane protein
C. contains primarily alpha-helical residues
D. all of the above

Correct Answer: D. all of the above

3. In active transport, the membrane structure that functions is

A. cholesterol
B. integral proteins
C. carbohydrates
D. hydrophobic molecules

Correct Answer: B. integral proteins

4. Cholesterol is essential for normal membrane functions because of it

A. plugs up the cardiac arteries of older men
B. cannot be made by higher organisms
C. keeps membranes fluid.
D. spans the thickness of the bilayer

Correct Answer: C. keeps membranes fluid.

5. The model that is now known to be correct for the structure of the biological membrane is

A. Fluid mosaic model
B. Page’s model
C. Lac Operon model
D. Lock and Key model

Correct Answer: A. Fluid mosaic model

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