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Membrane Transport 1. What is the difference between a carrier and a channel? 2. What are...

Membrane Transport

1. What is the difference between a carrier and a channel?

2. What are the two ways energy can be coupled to active transporters?

3. What are the driving forces behind solute transport? Consider charged and uncharged solutes separately.

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Answer #1

1. Answer:- Following are the differences between a carrier and a channel:

(i) Channel proteins are lipoproteins and carrier proteins are glycoproteins.

(ii) channel proteins transport ions and carrier proteins transport molecules.

(iii) position of channel protein is fixed but carrier proteins flip between two conformations.

(iv) channel proteins have high transport rate but carrier proteins have low transport rate.

(v) channel protein only transport what're soluble molecules but carrier proteins both water soluble and insoluble molecules.

2. Answer:- there are two types of energy that can be coupled to active transport . They are (i) primary active transport that uses ATP and (ii) secondary active transport that uses electrochemical gradient.

3. Answer:- The main driving force behind the uncharged solute transport is the difference between the concentration of solute on the both side of the semipermeable membrane. On the other hand the main driving force behind the charged solute transport is the difference between electrochemical potential gradient of the solute on the both side of the semipermeable membrane.

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