cell processes

Question 1

non-mediated transport is important for:

Answer 1

absorption of nutrients, excretion of wastes

Question 2

non-mediated transport allows the passage of:

Answer 2

Nonpolar, hydrophobic molecules

Question 3

stimuli of opening/closing channel include:

Answer 3

voltage, ligand binding, cell volume (stretch), pH, phosphorylation

Question 4

properties of carrier-mediated transport:

Answer 4

Specificity
Inhibition
Competition
Saturation (transport maximum)

Question 5

primary active transport:

Answer 5

• energy is directly derived from the hydrolysis of ATP
• A typical cell uses 30% of its energy (ATP) on primary active transport

Question 6

secondary active transport:

Answer 6

• energy stored in an ionic concentration gradient is used to drive the active transport of a molecule against its gradient

Question 7

Na/KATPase is a type of:

Answer 7

primary active transport

Question 8

glucose transport is a type of:

Answer 8

facilitated diffusion