Cell Function

Question 1

Word describing molecule that is both hydrophillic & hydrophobic

Answer 1

amphipathic

Question 2

Model name of cell membrane

Answer 2

Fluid mosaic model

fluid: moving
mosaic: protein embedded

Question 3

What would a fluid membrane be majorly composed of?

Answer 3

unsaturated hydrocarbon tails

double bond –> less packed –> more fluid

Question 4

What would a viscous membrane be majorly composed of?

Answer 4

saturated hydrocarbon tails

single bond –> more packed

Question 5

What purpose does cholesterol in cell membrane serve?

Answer 5

at high temp: prevent membrane from getting too fluid

at low temp: prevent membrane from getting too viscous

Question 6

6 Major functions of membrane protein

Answer 6

1. Transport
2. Enzymatic activity
3. Signal transduction
4. Cell-cell recognition
5. Intercellular joining
6. Attachment to cytoskeleton and extracellular matrix

Question 7

3 Types of molecule that are impermeable to cell membrane

Answer 7

1. ions
2. macromolecules
3. small hydrophillic molecules (e.g. glucose)`

Question 8

4 types of transportation

Answer 8

1. Passive diffusion
2. Facilitated diffusion
3. Active Transport
4. Cotransport

Question 9

4 types of receptors (ordered according to reaction speed)

Answer 9

1. Ion channel receptor
2. G protein-coupled receptor
3. Tyrosine-kinase linked receptor
4. Intracellular receptor (steroid receptor)

Question 10

Which receptor involves the use of second messenger?

Answer 10

G protein-coupled receptor

Question 11

Which receptor involves phosphorylation?

Answer 11

Tyrosine kinase linked receptor