4

Question 1

two things that effect enzyme activity

Answer 1

• changes in pH

- temperature changes

Question 2

for the reaction to be exergonic, what must occur

Answer 2

the entropy of the products must be greater than the entropy of the reactants

Question 3

explain the fluid mosaic model

Answer 3

Membranes are not rigid with molecules locked in place but they are suspended individually in a fluid of lipid bilayer

Question 4

The lipid bilayer is

Answer 4

formed of phospholipids

Question 5

As growth temperature decreases

Answer 5

desaturase abundance goes up, which results in the synthesis of the desaturase enzyme

Question 6

what are the roles of membrane proteins (4)

Answer 6

• transport
• enzymatic activity
• signal transduction
• attachment

Question 7

two kinds of membrane proteins

Answer 7

integral(inside) and peripheral (outside)

Question 8

difference between passive transport and active transport (3)

Answer 8

explaining active, passive is opposite

• molecules move against a concentration gradient (low con to high con)
• Cellular energy ATP is required but not required in passive
• proton pump is example and diffusion/osmosis is example of passive

Question 9

two different kinds of transport proteins

Answer 9

• Channel-form hydrophilic pathways in membrane to let molecules through
• Carrier - binds to a single solute such as an amino acid and transports it across lipid bilayer

Question 10

two classes of active transport

Answer 10

• primary - the same protein that transports a substance also hydrolyses ATP to power the transport directly
• secondary - transport is indirectly driven by ATP