Chapter 13: Membrane Channels and Pumps

Question 1

Uniporter

Answer 1

Secondary transporter that moves one substrate across the cellular membrane by solely using the chemical potential of the substrate as their driving force

Question 2

Symporter

Answer 2

Secondary transporter that moves two different molecules across the cell membrane in the same direction

Question 3

Antiporter

Answer 3

Secondary transporter that moves two different molecules or ions across the cell membrane in opposite directions

Question 4

Primary active transporter

Answer 4

Directly uses a source of chemical energy such as ATP to move molecules across a membrane against their gradient

Question 5

Secondary active transporter

Answer 5

Uses energy stored in the electrochemical gradients created by primary active transporters to move other substances against their own gradients

Question 6

P‑type ATPases

Answer 6

P-type ATPases are primary transporters that interconvert between E₁ and E₂

They are capable or auto-phosphorylation and form a phosphorylated aspartate intermediate

Involved in the transport of ions and phospholipids

Question 7

ABC transporters

Answer 7

Transport a variety of compounds like lipids, drugs and vitamins across the plasma membrane OUT of the cell