Chapter 11

Question 1

amphipathic

Answer 1

Having both hydrophobic and hydrophilic regions, as in a

phospholipid or a detergent molecule

Question 2

cholesterol

Answer 2

Short, rigid lipid molecule present in large amounts in the
plasma membranes of animal cells, where it makes the lipid
bilayer less flexible

Question 3

fat droplet

Answer 3

Large cluster of hydrophobic fats or oils that forms inside

the cells.

Question 4

lipid bilayer

Answer 4

Thin pair of closely juxtaposed sheets, composed mainly of
phospholipid molecules, that forms the structural basis for
all cell membranes.

Question 5

membrane protein

Answer 5

A protein associated with the lipid bilayer of a cell

membrane.

Question 6

phosphatidylcholine

Answer 6

Common phospholipid present in abundance in most cell
membranes; uses choline attached to a phosphate as its
head group

Question 7

phospholipid

Answer 7

A major type of lipid molecule in many cell
membranes. Generally composed of two fatty
acid tails linked to one of a variety of phosphatecontaining polar group

Question 8

plasma membrane

Answer 8

The protein-containing lipid bilayer that surrounds a living
cell

Question 9

saturated

Answer 9

Describes an organic molecule that contains a full
complement of hydrogen; in other words, no double or
triple carbon–carbon bonds.

Question 10

unsaturated

Answer 10

Describes an organic molecule that contains one or more

double or triple bonds between its carbon atoms.