Plasma Membrane

Question 1

Also called cell membrane

Answer 1

Plasma membrane

Question 2

Biological membrane separating the interior of a cell from the outside environment

Answer 2

Plasma membrane

Question 3

It functions as a boundary separating the substances inside the cell, which are…

Answer 3

intracellular

Question 4

from substances outside the cell, which are

Answer 4

extracellular.

Question 5

encloses and supports the cell contents

Answer 5

Plasma membrane

Question 6

it attaches cells to the extracellular environment or to other cells

Answer 6

Plasma membrane

Question 7

the cells’ ability to recognize and communicate with each other takes place through the

Answer 7

Plasma membrane

Question 8

the plasma membrane determines what moves into and out of cells

Answer 8

semipermeable

Question 9

The plasma membrane consists of __- __% lipids

Answer 9

45–50%

Question 10

The plasma membrane consists of __–__% proteins

Answer 10

45–50%

Question 11

The plasma membrane consists of -% carbohydrates

Answer 11

4–8%

Question 12

readily assemble to form a lipid bilayer

Answer 12

Phospholipids

Question 13

The phospholipid bilayer consists of a _____, which is hydrophilic (water loving)

Answer 13

polar ‘head’ end

Question 14

water loving

Answer 14

hydrophilic

Question 15

_____, which are hydrophobic (water hating).

Answer 15

fatty acid ‘tails’

Question 16

water hating

Answer 16

hydrophobic

Question 17

situated on the outer and inner surfaces of the cell

Answer 17

hydrophilic heads

Question 18

point into the cell membrane as they are ‘water‐hating’ end

Answer 18

hydrophobic areas

Question 19

is the other major lipid in the plasma membrane

Answer 19

Cholesterol

Question 20

is interspersed among the phospholipids and accounts for about one-third of the total lipids in the plasma membrane.

Answer 20

Cholesterol

Question 21

amount of cholesterol in a particular plasma membrane is a major factor in determining the _______ of the membrane

Answer 21

fluid nature

Question 22

limits the movement ofphospholipids

Answer 22

Cholesterol

Question 23

penetrate deeply into the lipid bilayer, in many cases extending from one surface to the other

Answer 23

Integral membrane proteins

Question 24

are attached to either the inner or the outer surfaces of the lipid bilayer

Answer 24

Peripheral membrane proteins

Question 25

Allow cells to identify other cells or other molecules.

Answer 25

Marker molecules

Question 26

cell surface marker

Answer 26

Glycoprotein

Question 27

Anchor cells to other cells (cadherins) or to extracellular molecules (integrins)

Answer 27

Attachment proteins

Question 28

Attachment proteins

Answer 28

Integrins

Question 29

Form passageways through the plasma membrane, allowing specific ions or molecules to enter or exit the cell; may be gated or nongated

Answer 29

Channel proteins

Question 30

Move ions or molecules across the membrane; binding of specific chemical to carrier proteins causes changes in the shape of the ___; then move the specific chemical across the membrane

Answer 30

Carrier proteins