6. The Membrane

The fluid mosaic model of the membrane proposed that membranes:

What is a fiber composite? How do cellular fiber composites resemble reinforced concrete?

According to the fluid mosaic model of membrane structure, proteins of the membrane are mostly

a. Spread in a continuous layer over the inner and outer surfaces of the membrane.

b. Confined to the hydrophobic interior of the membrane.

c. Embedded in a lipid bilayer.

d. Randomly oriented in the membrane, with no fixed inside-outside polarity.

Which of the following factors would tend to increase membrane fluidity?

a. A greater proportion of unsaturated phospholipids

b. A greater proportion of saturated phospholipids

c. A lower temperature

d. A relatively high protein content in the membrane

Which best describes the structure of a cell membrane?

a. Proteins between two bilayers of phospholipids

b. Proteins embedded in a bilayer of phospholipids

c. A bilayer of protein coating a layer of phospholipids

d. Cholesterol embedded in a bilayer of phospholipids