Cellular Membrane Quiz

Question 1

What is the function of the Plasma Membrane?

Answer 1

To control what enters and leaves the cell

Question 2

Selective Permeability

Answer 2

Somethings are allowed to pass while others are rejected

Question 3

What are the molecules of the plasma membrane?

Answer 3

Phospholipids
Proteins
Carbs
Cholesterol
CHO

Question 4

Amphipathic

Answer 4

Hydrophobic and Hydrophilic region

Question 5

Which part of a phospholipid is polar and hydrophilic?

Answer 5

The head

Question 6

Which part of a phospholipid is nonpolar/hydrophobic

Answer 6

The tail

Question 7

Examples of amphipathic molecules

Answer 7

Phospholipids and membrane proteins

Question 8

Fluid Mosaic Model

Answer 8

Phospholipids and proteins drift laterally within the membrane

Question 9

How fast do phospholipids move?

Answer 9

100,000,000 times/ second

Question 10

Compared to phospholipids, how fast to membrane proteins move?

Answer 10

Slower

Question 11

Describe the relationship between fluidity and temperature.

Answer 11

As temperature increases, fluidity increases

Question 12

Tell about fluidity and membrane composition

Answer 12

Unsaturated fatty acid tails are kinked and prevented from tight packing

Question 13

How does cholesterol affect the plasma membrane at warmer temps?

Answer 13

At higher temps, cholesterol restricts phospholipid movement

Question 14

How does cholesterol affect the plasma membrane at cooler temps?

Answer 14

Acts as a wedge between phospholipids preventing tight packing.

Question 15

What type of cell is cholesterol found in?

Answer 15

Animal cells ONLY

Question 16

How to plants adapt to help their plasma membrane as conditions change around them?

Answer 16

Winter Wheat, for example, starts to produce more unsaturated fatty acid tails as winter approaches.

Question 17

How do cold water fish adapt to their surroundings (concerning their plasma membranes)?

Answer 17

They make more cholesterol and unsaturated fatty acid tails.

Question 18

Peripheral

Answer 18

Found on surface of outside and inside of membrane

Question 19

Integral

Answer 19

Embedded within the membrane. So go all the way through the membrane.

Question 20

Name at LEAST 3 functions of the membrane proteins

Answer 20

Transport
Enzymatic activity control
Signal transduction
Cell to cell recognition
Intercellular joining
Attachment to the cytoskeleton and extracellular matrix

Question 21

How many kinds of membrane CHO are their?

Answer 21

2

Question 22

Glycolipid

Answer 22

CHO connected to a lipid

Question 23

Glycoprotein

Answer 23

CHO connected to a protein

Question 24

Give examples of cell to cell recognition

Answer 24

Immunity and WBC

Embryonic development

Question 25

How do molecules pass thru the Plasma Membrane

Answer 25

Nonpolar pass thru with ease Polar and large molecules must pass thru transport proteins. H2O can diffuse thru, but slowly

Question 26

What are the 2 types of transport proteins

Answer 26

Carrier and channel

Question 27

Carrier proteins

Answer 27

Carries things and changes shape (specific to molecule)

Question 28

Channel proteins

Answer 28

ACts as a tunnel for substances (specific to molecule)

Question 29

Aquaporin

Answer 29

Channel proteins that are specific to water

Question 30

FLuid

Answer 30

Phospholipids constant motion, proteins drift

Question 31

Mosaic

Answer 31

Variety of proteins embedded and attached to membrane

Question 32

What is cholesterols job?

Answer 32

Maintain and restrict membrane flexibility and fluidity