Active transport

Question 1

What does active transport mean?

Answer 1

is the movement of molecules across a biological membrane from an area of lower concentration to an area of higher concentration, against the concentration gradient, with the assistance of energy.

Question 2

does active transport require energy ?

if it does where does the energy come from?

Answer 2

Yes

This energy is provided by mitochondria in
the form of ATP and cells performing active
transport on a large scale contains
numerous mitochondria

Question 3

What does active transport depend on?

Answer 3

on the proteins in the cell
membrane to transport specific molecules or ions.

Question 4

What type of carriers are there? (3)

Answer 4

uniport carriers:one substance in one direction

symport carrier: two substances in one direction

antiport carriers:two substances in opposite directions

Question 5

What are the two hypotheses on how the mechanisms of active transport work?

Answer 5

Active transport occurs across a partially
permeable membrane

Carrier proteins within the membrane
allow this movement to occur

Question 6

What are the examples of active transport in plants and animals?

Answer 6

Plant cells: root hair cells take in nitrates from
the soil even though the concentration within the
cell is higher than that in the soil

Animal cells: glucose being reabsorbed by the
kidneys from the kidney tubules