Membranes And Cell Components

Question 0

Describe the relationship between protein folding and function.

Answer 0

Function depends on the protein being in the correct

Confirmation. Many enzymes bind to thei substrate through specific interactions

Question 1

How does the order of amino acids determine the way in which the protein folds

Answer 1

Because of the various interaction between amino acids and the bonds formed between them, a secondary and tertiary structure is achieved. They must be arranged correctly for the protein to function

Question 2

Describe how hydrophobic and hydrophilic regions behave in an aqueous environment.

Answer 2

The hydrophilic heads orient together towards the polar environment and the hydrophobic tails orient together to form a water free environment in the center.

Question 3

Describe two ways in which proteins interact with the membrane

Answer 3

Integral proteins span the membrane and usually have both hydrophobic and hydrophilic parts. Cannot be removed.
Peripheral proteins can be removed easily. Usually only hydrophilic. Can be associated with the interior or exterior of the membrane.

Question 4

Explain the role of lipids and proteins in maintaining the selectively permeable barrier

Answer 4

Phospholipid bilateral allows small uncharged molecules through the. Membrane. Everything else must travel through the membrane proteins.

Question 5

Describe passive transport.

Answer 5

Diffusion across the membrane. No energy needed.

Question 6

Define active transport

Answer 6

Uses energy which leads to unequal distribution

Uses membrane proteins.

Question 7

What three elements do membranes contain?

Answer 7

Lipids
Carbohydrates
Proteins

Question 8

What element reduces fluidity in the phospholipid bilayer?

Answer 8

Cholesterol.

Question 9

What is an example of active transport

Answer 9

Na/k pumps