Campbell Biology: cellular membranes Flashcards


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created 10 years ago by agillis1
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Campbell Biology
Chapter 7
updated 10 years ago by agillis1
Grade levels:
College: First year
Subjects:
biology, science, life sciences
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1

Phospholipids are the most

Abundant lipid in the plasma membrane

2

Phospholipids are amphipathic molecules, containing?

hydrophobic and hydrophilic regions.

3

What does the fluid mosaic model state?

that a membrane is a fluid structure with a "mosaic of various proteins embedded in it.

4

Cellular Membranes are made of what?

Proteins and lipids

5

Phospholipids in the plasma membrane can move

within the bilayer

6

Most of the lipids and some proteins

drift laterally

7

Rarely does a molecule

flip-flop transversely across the membrane.

8

As temperatures cool,membranes

switch from a fluid state to a solid state

9

What depends on the types of lipids?

the temp at which a membrane solidifies

10

Membranes rich in unsaturated fatty acids are?

are more fluid than those rich in saturated fatty acids

11

Membranes must be what to function properly?

Fluid (usually about as fluid as salad oil)

12

The steroid cholesterol has different effects on what?

Membrane fluidity at different temperatures

13

At warm temperatures (such as 37c)

cholesterol restrains movement of phospholipids

14

At cool temperature it maintains fluidity by

preventing tight packing