3.2 Plasma Membrane

Question 1

membrane, composed of phospholipids, cholesterol, and proteins, that encloses cell contents; outer limiting cell membrane

Answer 1

Plasma membrane

Question 2

depiction of the structure of the membranes of a cell as phospholipid bilayers in which proteins are dispersed

Answer 2

Fluid mosaic model

Question 3

water loving

Answer 3

Hydrophilic

Question 4

water fearing

Answer 4

Hydrophobic

Question 5

lipid with one or more sugars attached by a covalent bond

Answer 5

Glycolipid

Question 6

found only on the outer membrane surface

Answer 6

Glycolipid

Question 7

makes up 5% of membrane lipid

Answer 7

Glycolipid

Question 8

stabilizes the membrane and decreases the mobility of the phospholipids and the fluidity of the membrane

Answer 8

Cholesterol

Question 9

wedges between the phospholipid tails

Answer 9

Cholesterol

Question 10

makes up 20% of membrane lipid

Answer 10

Cholesterol

Question 11

responsible for most of the specialized membrane functions; some float freely, others are “tethered”

Answer 11

Membrane proteins

Question 12

Makes up about half of plasma membrane by mass

Answer 12

Membrane proteins

Question 13

protein embedded in the lipid bilayer

Answer 13

Integral proteins

Question 14

proteins that spans the entire membrane and protrudes on both sides

Answer 14

Transmembrane proteins

Question 15

proteins that help support the membrane from its cytoplasmic side

Answer 15

Peripheral proteins

Question 16

sugar coating over cells

Answer 16

Glycocalyx

Question 17

membrane transport where the substance moves down its concentration gradient and does not require ATP

Answer 17

Passive process

Question 18

membrane transport that only occurs in living cell membranes and requires ATP

Answer 18

Active process