Module 17: Cell Membranes

Question 1

Why are Cell Membranes considered Selectively Permeable?

Answer 1

1. Allows cells to select what comes in, what stays out and what stays in.
2. Membranes are fluid mosaics made of amphipathic molecules.

Question 2

What is Amphipathic molecules?

Answer 2

Have both charged (polar)and uncharged (nonpolar) regions.

(polar)example polar, acidic & basi

Question 3

Basic unit of a membrane?

Answer 3

Phospholipids also have protein & cholesterol

Question 4

Two layers of phospholipids or large amount?

Answer 4

Phospholipids Bilayer

Question 5

Micelle

Answer 5

Small amounts of phospholipids in water

Question 6

A charged region & uncharged region is what?

Answer 6

Amphipathic

Question 7

The Fluid Mosaic Model

Answer 7

Membrane is very Fluid ( lots of molecular movement) Mosaic (Many individual parts making up that membrane)

Question 8

Integral membrane protein

Answer 8

Embedded in membrane- has cytoplasmic & extracellular sides

Question 9

Peripheral membrane protein

Answer 9

found on one side of membrane only

Question 10

Glycoprotein

Answer 10

Glyco-(sugar,carbohydrate) Protein-(polymer of amino acids)

Question 11

Gylcolipids

Answer 11

Glyco-carbohydrate; Lipid- hydrophobic

Question 12

Different carbohydrates do what?

Answer 12

Indicates what belongs in our body & what doesn’t

Question 13

Cholesterol does what for the membrane

Answer 13

Helps maintain strength of the membrane.

Question 14

Protein membrane play?

Answer 14

Transport of substances across membrane, In & Out. 
The substances tend to be charged (sodium ion Na+)
Also polar (sugars&water)

Question 15

Transport pass what?

Answer 15

Polar and charged molecules

Question 16

Signaling molecule?

Answer 16

Allows cells to sense and respond to environment

Question 17

Anchoring cell function?

Answer 17

1. to form tissues to other cells

Question 18

Cell-cell recognition?

Answer 18

Sense self and non-self cells

Question 19

Do membrane proteins move?

Answer 19

yes, they do move example the mouse cell & the human cell fused together.

Question 20

Would the membrane of a cold-loving organism have a lot of unsaturated or saturated fatty acids?

Answer 20

Unsaturated

Question 21

What about a organism that lives in a hot spring would they use unsaturated or saturated fatty acids?

Answer 21

Saturated