2. Cell Chemistry & Cell Components

Why are cell membranes composed primarily of hydrophobic molecules?

Which of the following statements about the role of phospholipids in the structure and function of biological membranes is correct?

The plasma membrane is referred to as a "fluid mosaic" structure. Which of the following statements about that model is true?

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