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Yr 11 Bio: Crossing the plasma membrane

Total questions: 50

Worksheet time: 1hrs 6mins

Name
Class
Date
1.

The cell membrane is _______________ permeable.

a)

selectively

b)

somewhat

c)

physically

d)

ionically

2.

The cell membrane is mostly made of what?

a)

Membrane-spanning Proteins

b)

Surface Proteins

c)

Phospholipids

d)

Carbohydrates

3.

What are the two parts of a phospholipid?

a)

head

b)

enzyme

c)

tail

d)

hormone

4.

What forms due to a difference in concentration of particles on opposite sides of the membrane?

a)

concentration flow

b)

concentration gradient

c)

equilibrium

d)

diffusion gradient

5.

Particles move across the membrane ___________ attempting to reach equilibrium.

a)

orderly

b)

slowly

c)

randomly

d)

in a single file line

6.

The phospholipid head is _____________ & _____________

a)

Hydrophilic

b)

Hydrophobic

c)

Polar (+)

d)

Uncharged

7.

The phospholipid tail is _____________ & _____________

a)

Hydrophilic

b)

Hydrophobic

c)

Polar (+)

d)

Uncharged

8.

Ions such as Na+ and K+ are unable to move across the membrane freely because of what reason?

a)

the charge particle repels against the charged phospholipid head

b)

the neutral particle repels against the charged phospholipid head

c)

the charge particle attracts the charged phospholipid head

d)

the neutral particle attracts the neutral phospholipid head

9.

Identify cholesterol molecule

a)

structure a

b)

structure b

c)

structure h

d)

structure i

10.

Identify a peripheral protein

a)

structure a

b)

strucure b

c)

structure g

d)

structure h

11.

Plasma membranes are selectively permeable. This means

a)

anything can pass in and out

b)

the membrane regulates the passage of the material in and out of the cell

c)

glucose cannot enter the cell

d)

cholesterol cannot enter

12.

Small, nonpolar, hydrophobic molecules such as fatty acids

a)

easily pass through the membrane's bilayer

b)

very slowly diffuse through the bilayer

c)

require transport proteins

d)

enter through endocytosis

13.

Membrane phospholipids

a)

have hydrophobic heads that face the center of the membrane and are shielded from water

b)

have hydrophilic tails that face outward

c)

remain fluid because they are tightly packed

d)

none of these

14.

Which of the following substances would have the most trouble crossing the membrane by diffusing through the bilayer?

a)

water

b)

oxygen

c)

carbon dioxide

d)

a sodium ion

15.

The cholesterol associated with membranes

a)

is attached to proteins and extends into the environment surrounding the cell

b)

helps stabilize the membrane at body temperature

c)

is an abnormality resulting from a diet high in cholesterol

d)

both a and c

16.

The fluid mosaic model describes a membrane consisting of

a)

a phospholipid bilayer with embedded proteins

b)

2 layers of phospholipids with proteins in between

c)

individual proteins and phospholipids that can drift

d)

both a and c

17.

What kinds of molecules pass through a cell membrane most easily?

a)

ionic

b)

small and hydrophobic

c)

large polar

d)

large and hydrophobic

18.

Which of the following would likely move through the lipid bilayer most rapidly?

a)

potassium

b)

an amino acid

c)

Carbon dioxide

d)

glucose

19.

Which structure is the hydrophilic polar head of the phospholipid molecule?

a)

F

b)

D

c)

C

d)

A1

20.

Which structure is the hydrophobic tail of the phospholipid molecule?

a)

E

b)

B

c)

G

d)

A2

21.
Which diagram best shows the end result of diffusion?
a)
F
b)
G
c)
H
d)
J
22.
The picture  is an example of _________________.
a)
isotonic
b)
diffusion
c)
osmosis
d)
active transport
23.
Where is there a high concentration of bbq smoke?
a)
In the bbq pit
b)
In the house
c)
Two streets over
d)
In the atmosphere
24.
A student put a few drops of lemon juice into an uninflated balloon.The student tied a knot in the balloon, placed it in a shoe box, and covered it with a lid. The following day, the student opened the box and was able to smell lemon in the box. Through what process were molecules able to pass through the balloon?
a)
respiration
b)
fermentation
c)
osmosis
d)
diffusion
25.
What does “high concentration area” mean?
a)
Spread out
b)
Tightly packed together
c)
Uncrowded
d)
Spacious
26.
Diffusion is the movement of molecules from an area of _____ concentration to an ______ concentration
a)
High, low
b)
Low, high
c)
Low, low,
d)
High, high
27.
In diffusion, particles move down a _______ ________
a)
Concentrate gradient
b)
Conceited gradient
c)
Concentration gradient 
d)
Concentrated orange juice
28.
If there is more oxygen in the blood than in an organ, which direction would the oxygen move?
a)
Out of the blood
b)
Into the blood
29.
A higher concentration gradient, slows down diffusion. True or false?
a)
True
b)
False
30.
An increase in temperature does what to diffusion?
a)
Speeds it up
b)
Slows it down
c)
Has no effect
d)
I wish i knew. Really I do.
31.

Diffusion & Facilitated Diffusion are both __________ transport.

a)

Passive

b)

Active

c)

Easy

d)

Free

32.

Passive Transport is the movement of particles across the membrane from an area of [ ___ ] to an area of [ ___ ]

a)

high to low

b)

low to high

c)

low to low

d)

high to high

33.

Passive Transport uses ____ energy

a)

no

b)

a lot of

c)

a little bit of

d)

some

34.

What is the movement of particles with the concentration gradient using protein "helpers"?

a)

diffusion

b)

facilitated diffusion

c)

active transport

d)

enzymatic reactions

35.

An example of facilitated diffusion is

a)

CO2 and O2 exchange in the lungs

b)

Glucose transport

c)

Na+ / K+ Pumps

d)

Endocytosis

36.

Facilitated diffusion needs what to get particles from one side of the membrane to the other?

a)

a membrane-spanning protein

b)

a surface protein

c)

a phospholipid

d)

a carbohydrate

37.
Osmosis is the diffusion of _____ across a selectively permeable membrane.
a)
food
b)
air
c)
water
d)
oxygen
38.
 In the given scenario what will happen?  An egg with a dissolved shell is placed in pure water for 48 hours.
a)
Water will move in and out of the cell equally, and the cell with neither shrink nor swell.
b)
The egg will gain water and swell.
c)
The egg will lose water and shrink.
39.
 An animal cell placed in a hypertonic (salty) solution will
a)
Stay the same
b)
Shrink- get smaller
c)
Swell- get bigger
40.
Ideally, your cells should be in a(n) _______ solution
a)
isotonic
b)
hypertonic
c)
hypotonic
d)
isometric
41.
If a shipwrecked individual drinks sea water, they will probably die.
How would you describe the solution compared to the cells?
a)
isotonic
b)
hypertonic
c)
hypotonic
42.
What protects carrot cells from swelling too much when it rains?
a)
They don't swell because rain is absorbed by the roots.
b)
They have pores in their cell membranes that keep them from swelling.
c)
The rain water is hypertonic to the cells so the cells lose water.
d)
They have cell walls that keep them from swelling too much.
43.
What is plasmolysis?
a)
Pulling away of the plant cell membrane as it loses water in a hypertonic solution.
b)
Pulling away of the animal cell membrane as it undergoes osmosis.
c)
An increase in turgor pressure as the cell undergoes osmosis.
d)
Contraction of the protoplast of a plant cell as a result of gaining water.
44.
What type of cellular transport uses energy?
a)
Passive Transport
b)
Active Transport
45.
A student noticed that placing wilted lettuce in a bowl of cool water caused the lettuce to become more crisp and firm. What is the best explanation for his observation?
a)
Water moved into the lettuce cells by active transport.
b)
Water moved into the lettuce cells by osmosis.
c)
Salt moved into the lettuce cells by diffusion.
d)
Water moved out of the lettuce cells by osmosis.
46.
The cell below is in a _________ solution.
a)
Hypotonic
b)
Hypertonic
c)
Isotonic
47.
The cell below is in a _____________ solution.
a)
Hypertonic
b)
Hypotonic
c)
Isotonic
48.

After examining this diagram showing the concentration of water inside and outside of the cell, identify the tonicity of the solution.

a)

hypertonic

b)

hypotonic

c)

isotonic

49.

The solution surrounding the cell in Diagram B, would be defined as:

a)

hypertonic

b)

hypotonic

c)

isotonic

50.

This egg has shrunk, what type of solution was it placed in?

a)

hypotonic solution

b)

hypertonic solution

c)

isotonic solution

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