Phospholipid

Question 1

what are phospholipids

Answer 1

They are found in cell membrane, or sometimes called plasma membrane

Prevents the movement of molecules through cells

Polar and non-polar section that allows this to occur

Transporter - (polar and nonpolar molecules)

Transport out of the cell to be released (hormones,

Transport to membrane for enzyme / protein functions (channels, proton pumps etc)

Head hydrophilic
Tail hydrophobic

Question 2

types of phospholipids

Answer 2

waxes

steroids

Question 3

waxes

Answer 3

in plants → found on the surface of leaves (prevent water sticking to it)

Fatty acid connected to long chain alcohol (hydroxyl) with ester linkage

Repel Water (Waterproof)
High Melting Point
Resistant to degradation

Question 4

steroids

Answer 4

Characterized by a carbon skeleton consisting of four fused rings

Some sterols can be hormones that have various effects on different parts of an organism
Cholesterol is a component in animal cell membranes

Question 5

cholesterol

Answer 5

Nonessential – made by our bodies

Maintains fluidity of cell membrane

Precursor to many hormones

High levels in the blood may contribute to cardiovascular disease

Question 6

Lipoproteins

Answer 6

Lipoproteins are clusters of proteins and lipids all tangled up together.

Carry lipids, including cholesterol, around in our blood.

Question 7

two types of lipoproteins

Answer 7

LDL or low density lipoprotein
HDL or high density lipoprotein

Question 8

LDL

Answer 8

low density lipoprotein cause deposition of “cholesterol” on the walls of someone’s arteries

Question 9

HDL

Answer 9

high density lipoprotein carry “cholesterol” out of the blood system