Cell Membranes

Question 1

what are the two main constituents of a cell membrane?

Answer 1

lipids

proteins

Question 2

which part of a phospholipid is hydrophillic?

Answer 2

the head (faces outwards)

Question 3

which part of a phospholipid is hydrophobic?

Answer 3

the tail (faces inwards)

Question 4

what are cell membranes impermeable to?

Answer 4

charged molecules

Question 5

what can move easily across the cell membrane?

Answer 5

small, uncharged, polar molecules

Question 6

what are the two broad classes of membrane proteins?

Answer 6

peripheral

integral

Question 7

what is a peripheral membrane protein?

Answer 7

one that is not embedded within the membrane

Question 8

what is an integral membrane protein?

Answer 8

ones that are intimately associated with the lipid bilayer