Question

a membrane. Classify each of the seven images as an example of a uniport, symport, or antiport transport system. Uniport Symport Antiport Nat OOH ATPO ADP+P: ATP pyruvate H* HCO3 ADP+P: Ca 2+ Nat glucose O Nat Solved

Answer 1

answer:

uniport:

the images shown in the block labelled as UNIPORT are the examples of that process.

Uniport: Transfer of a substrate which can be charged or uncharged ( i.e single type) across a cell membrane by a uniporter which is an integral membrane protein. this process uses the facilitated diffusion and the transportation takes place along the diffusing gradient or against the active transport.

these proteins (uniporters) usually works by binding with the molecule of a substrate at a time. The uniporter channels are present which responses to stimulus and allows the free flow. These channels are opened due to voltage, ligand or stress.

examples:

• causing nerve impulses across the neuron through volgated gated Na channels.
• Transfer of calcium through voltage gated Ca channels into the presynaptic neuron.
• K leak channels (as shown in the fig.) resting the membrane potential after impulse transmission.

Symport:

the images shown in the block labelled as SYMPORT are the examples of that process.

Symport means the movement of a transported material and a co-transported ion in the same direction..mThey do not require ATP

transporters (symporter) : known as membrane proteins.They get powered by the ion gradients ( H+, Na+) causing the movement of substances against a concentration gradient.

example:

• Transport of amino acids across the intestinal lining in the human gut.

Antiport (counter-transport):

he images shown in the block labelled as ANTIPORT are the examples of that process.

the process is a secondary active transport which means that solutes are moving along their electrochemical gradient unlike moving along with their concentration gradient in active transport.

antiport involves one cotransporter and one integral membrane protein which carries out the transport of two or more different molecules or ions across a phospholipid membrane.

examples:

• Na+/ H+ antiporters
• Na+/CA2+ antiporters