active transport

Question 1

what is the definition of active transport?

Answer 1

the movement of molecules or ions against a concentration gradient. lower to higher concentration
requires atp

Question 2

what proteins does active transport occur through?

Answer 2

intrinsic proteins spanning the membrane

Question 3

what is rate of active transport limited by?

Answer 3

number of available carrier proteins

Question 4

what processes involve active trasnport?

Answer 4

muscle contraction

nerve impulse transmission

reabsorption of glucose from kidney

mineral uptake into plant root hairs

Question 5

how does active transport of a single molecule or ion occur?

Answer 5

1) the molecule or ion combines with a specific carrier protein outside the membrane

2) ATP transfers a phosphate group to the carrier protein on the inside of the membrane

3)The carrier protein changes shape and carries the molecule or ion across the membrane to the inside of the cell

4) the molecule or ion is released into the cyptoplasm

5)phosphate ion is released from carrier molecule back to the cyptoplasm and recombines with ADP to form ATP

6)carrier protein returns to its original shape

Question 6

how does cyanide affect active transport?

Answer 6

Cyanide is a respiratory inhibitor that binds to cytochrome in the electron transport chain, preventing ATP production.

As a result, cyanide prevents active transport.

Question 7

what is cyanide?

Answer 7

respiratory inhibitor