bio 2 exam 2

Question 1

plasma membrane has several primary
functions:

Answer 1

1. protects the cell from the outside environment and maintaining homeostasis
2. controls the cell’s cytoplasmic contents
3. senses the environment

Question 2

The plasma membrane binds to

Answer 2

to the cytoskeleton and extracellular matrix (ECM)
-help maintain the cell’s shape

Question 3

Cholesterol in phospholipids

Answer 3

Cholesterol intercalates between phospholipids helps maintain structural integrity of the membrane. More rigid than phospholipids.

Question 4

The plasma membrane is selectively permeable

Question 5

The phospholipids in the membrane are in constant movement

Question 6

Cold temperature

Answer 6

Membrane becomes more fluid

Question 7

Warm temperatures

Answer 7

Membrane becomes less fluid

Question 8

Organisms can change the biochemistry of their membranes by

Answer 8

increasing the number of membrane proteins, amount of unsaturated fatty acids, or amount of cholesterol

Question 9

Diversity of proteins in membrane

Answer 9

1. Surface proteins
2. Transmembrane proteins: Controls what comes in and out; signal molecules; can detect things outside of the cell and change structure

Question 10

Different functions of membrane proteins

Answer 10

Anchor proteins: Interact with microfillaments and give integrity to cell
Enzyme proteins: Anchored to membrane; facilitate changes and convert molecules