Cell Membranes - Biological Membranes Are Lipid-Protein Bilayers

Question 1

Where do the hydrophobic tails interact with each other? Hydrophilic heads?

Answer 1

interior of the bilayer; with polar water

Question 2

Membrane fluidity __ as temperature drops.

Answer 2

decreases

Question 3

What happens when cell membranes get cold?

Answer 3

saturated fatty acids are replaced by unsaturated fatty acids & get shorter tails

Question 4

What are the three types of membrane proteins?

Answer 4

integral, peripheral, anchored

Question 5

What are carbohydrates attached to in the fluid mosaic model?

Answer 5

the outer surface of proteins or lipids

Question 6

Cholesterol affects membrane fluidity. True or False?

Answer 6

True

Question 7

Peripheral membrane proteins are noncovalently attached to __

Answer 7

either membrane surface

Question 8

__ may consist of multiple polypeptide subunits.

Answer 8

membran proteins

Question 9

Some __ membrane proteins span the entire membrane & some are partially embedded in the bilayer.

Answer 9

integral

Question 10

Anchored membrane proteins are covalently bonded to __ that are inserted into the membrane.

Answer 10

lipids

Question 11

The endomembrane system’s subcellular membranes are vey __ chemically. Membranes are changed chemically when they __.

Answer 11

different; form parts of certain organelles