2.6.3 Phospholipids, Waxes, and Steroids Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

phospholipids

A
  • components of cell membranes that have both polar and nonpolar ends
  • similar to triglycerides, but they have two fatty acids
    attached to the glycerol molecule instead of three, and they have a phosphate group.
  • The phosphate end of a phospholipid can have charged molecules attached to it. This end is polar, and thus hydrophilic. The fatty acid end is nonpolar, and therefore hydrophobic. Because phospholipids have both polar and nonpolar ends, they can readily form a lipid bilayer.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

waxes

A
  • lipids that make up the cuticle of a leaf and serve as protective filters for organs, such as the ear
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

steroids

A
  • lipids that are composed of four fused rings
  • water insoluble molecules that consist of four fused carbon rings. One important steroid is cholesterol.
    • Cholesterol is a component of bile, a substance that the body makes for the digestion of fats.
    • When exposed to UV light, cholesterol forms Vitamin D.
    • Many sex hormones are formed from a cholesterol precursor.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Which are the most abundant lipids in the body?

A
  • phospholipids
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Which lipid has a structure that consists of a backbone formed by four fused carbon rings?

A
  • cholesterol
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

True or false?

Some sex hormones are produced from cholesterol.

A
  • true
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Phosphorus is an important component of lipids that are involved in

A
  • cell membranes
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Which statement about membrane phospholipids is not true?

a. Membrane phospholipids have three fatty acid components.
b. Membrane phospholipids have hydrophilic heads.
c. Membrane phospholipids have hydrophobic tails.
d. Membrane phospholipids can contain unsaturated fatty acids.

A
  • a. Membrane phospholipids have three fatty acid components
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Fats, phospholipids, and steroids have which of the following characteristics in common?

A
  • they are not soluble in water
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Which of the following is the most abundant membrane lipid?

A
  • phospholipids
How well did you know this?
1
Not at all
2
3
4
5
Perfectly