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Cell Membrane

Channel prote...

Question

Channel proteins are aquaporins in facilitated diffusion process. What does this statement mean?

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Solution

they are special channels for transport of water.

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Q. What are the aquaporins in facilitated diffusion process ?

Q. Facilitated diffusion requires protein channels to transport molecules across a membrane but does not require a concentrantion gradient.

Assertion: Both facilitated diffusion and active transport are mediated through membrane proteins.

Reason: Only active transport is selective in action.

Q. Which among the following statements are incorrect?
I. Transport proteins are needed by both facilitated diffusion and active transport.
II. Porins are carrier proteins
III. The carrier proteins needed by facilitated and active transport are specific.
IV. There is no need for energy to pump molecules against a concentration gradient in active transport.
V. Transport rate reaches saturation point when all the transport proteins are used or engaged.

Q. Properties related to facilitated diffusion and active transport but not to simple diffusion, are
A. Require special membrane proteins
B. Highly selective
C. Saturation
D. Response to protein inhibitors

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