Cell Membranes

Question 1

Which part of a phospholipid is charged?

Answer 1

Heads

Question 2

Which part of a phospholipid is non charged?

Answer 2

Tails

Question 3

What is a droplet of phospholipid bilayer called?

Answer 3

Liposomes

Question 4

What is the basic structure of a phospholid?

Answer 4

Glycerol, phosphate and fatty acid tail

Question 5

What is the structure of glycerol?

Answer 5

C3H8O3

Question 6

What is special about the structure of phosphatidylcholine?

Answer 6

Has a choline attached to the phosphate

Question 7

What is the phospholipid membrane of a cell permeable to?

Answer 7

Small uncharged compounds (water, CO2, O2…)

Question 8

What is the phospholipid bilayer not permeable to?

Answer 8

Large ions, hydrophilic compounds (e.g. glucose) and macromolecules

Question 9

What structure do transmembrane proteins generally have?

Answer 9

Alpha helical

Question 10

Do transmembrane proteins have an effect on fluidity?

Answer 10

Increases fluidity of the membrane by breaking up the regular structure

Question 11

Is the concentration of K+ greater within out outside the cell?

Answer 11

Within

Question 12

Is the concentration of Na+ greater within or outside the cell?

Answer 12

Outside

Question 13

How many Na+/K+ does the sodium potassium pump transport each pump?

Answer 13

3 Na+ and 2 K+

Question 14

How are glucose and amino acids transported into the cell?

Answer 14

Co-transported via facilitated diffusion

Question 15

Phospholipids can be positively/neutrally/negatively charged?

Answer 15

Neutrally or negatively

Question 16

Can phospholipids switch between layers?

Answer 16

Yes, flip-flop.

Question 17

What effect does cholesterol have on permeability and fluidity?

Answer 17

Decreases

Question 18

Where are erythrocytes produced?

Answer 18

Bone marrow

Question 19

What are immature erythrocytes called?

Answer 19

Reticulocytes

Question 20

What is haematocrit?

Answer 20

Packed cell volume