3.2 The Plasma Membrane

Question 1

This image shows _____

Answer 1

plasma membrane

Question 2

The _____ ______ is a flexible yet sturdy barrier that surrounds and contains the cytoplasm of the cell

Answer 2

plasma membrane

Question 3

Two types of membrane proteins are

Answer 3

1. integral proteins
2. peripheral proteins

Question 4

The different proteins help to determine the ____ of the the cell membrane.

a. porosity
b. functions
c. shape
d. placement

Answer 4

b. functions

Question 5

Another term for integral protein

Answer 5

transmembrane

Question 6

Membrane proteins can serve:

a) one function
b) a variety of functions

Answer 6

b) a variety of functions

Question 7

A _____
transports a specific substance across membrane by undergoing a change in shape.

a) receptor
b) cell identity marker
c) linker (integral & peripheral)
d) carrier

Answer 7

d) carrier (integral)

Question 8

Catalyzes reaction inside or outside cell (depending on which direction the active site faces).

a) receptor
b) cell identity marker
c) enzyme
d) carrier

Answer 8

c) enzyme (integral & peripheral)

Question 9

Recognizes specific ligand and alters cells functions in some way.

a) receptor
b) cell identity marker
c) enzyme
d) carrier

Answer 9

a) receptor (integral)

Question 10

Anchors filaments inside and outside the plasma membrane, providing structural stability and shape.

a) linker
b) carrier
c) ion channel (integral)
d) receptor

Answer 10

a) linker (integral & perripheral)

Question 11

Distinguishes your cells from anyone elses (unless you are an identical twin).

a) receptor
b) enzyme
c) linker
d) cell identity marker

Answer 11

d) cell identity marker (glycoprotein)

Question 12

A _____
forms a pore through which a specific ion can flow to get across membrane.

a) receptor
b) cell identity marker
c) ion channel (integral)
d) carrier

Answer 12

c) ion channel (integral)

Question 13

Membranes are ___ structures because most of the membrane lipids and many of the membrane proteins move easily in the bilayer.

a) rigid
b) thin
c) fatty
d) fluid

Answer 13

d) fluid

Question 14

Membrane lipids and proteins are mobile in their own half of the bilayer.

a) true
b) false

Answer 14

a) true

Question 15

_____ serves to stabilize the membrane and reduce membrane fluidity.

Answer 15

cholesterol

Question 16

Plasma membranes are selectively

a) permeable
b) non-permeable

Answer 16

a) permeable

Question 17

_____ are only able to pass through the plasma membrane by vesicular transport.

a) macromolecules
b) lipid bilayers
c) transmembranes

Answer 17

a) macromolecules

Question 18

_____ proteins that act as channels or transporters increase the permeability of the membrane.

a) transmembrane
b) lipid bilayer
c) macromolecule

Answer 18

a) transmembrane

Question 19

The ______ is/are always permeable to small, non polar, uncharged molecules.

a) transmembrane
b) macromolecules
c) lipid bilayer

Answer 19

c) lipid bilayer

Question 20

Together, a concentration and electrical gradient make up a/an ______ gradient

a) oppositional
b) protein
c) electrochemical

Answer 20

c) electrochemical

Question 21

A/An _____ gradient is the difference in concentration of ions between one side of the plasma membrane and the other

a) electrical
b) electrochemical
c) concentration

Answer 21

a) electrical

Question 22

A _______ gradient is the difference in the concentration of a chemical between one side of the plasma membrane and the other

a) electrical
b) concentration
c) electrochemical

Question 23

Transport processes that move substances across the cell membrane are _____ processes & _____ processes.

Answer 23

1. passive
2. active

Question 24

vesicular;

active or passive process?

Answer 24

active process

Question 25

primary and secondary transport;

active or passive processes?

Answer 25

active processes

Question 26

osmosis;

active or passive process?

Answer 26

passive process

Question 27

facilitated diffusion;

active or passive process?

Answer 27

passive process

Question 28

Simple diffusion

active or passive process?

Answer 28

passive process

Question 29

Diffusion is influenced by which of the following (check all that apply)

1. Steepness of the concentration gradient
2. Temperature
3. Mass of diffusion substance
4. Surface area
5. Diffusion distance

Answer 29

All of the above

Question 30

Which type of transport does this image depict, active ort passive?

Answer 30

passive transport: simple diffusion

Question 31

Transmembrane proteins help solutes that are too polar or too highly charged move through the lipid bilayer.

The processes involved are:

____ mediated facilitated diffusion

&

_____ mediated facilitated diffusion

Answer 31

channel

carrier

Question 32

Transmembrane proteins help _____ that are too polar or too highly charged move through the lipid bilayer.

Answer 32

solutes

Question 33

___________ proteins help solutes that are too polar or too highly charged move through the lipid bilayer.

Answer 33

lipid bilayer

Question 34

Transmembrane proteins help solutes that are too polar or too highly charged move through the ____ ____.

Answer 34

lipid bilayer