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Question

Membrane proteins are responsible for
  1. active transport
  2. all of these
  3. passive transport
  4. transport of water


Solution

The correct option is B all of these
Membrane proteins are responsible for both active and passive transport. Facilitated diffusion is a means of passive transport, where molecules are transported with the help of channel proteins and carrier proteins. Active transport is movement of substances against the concentration gradient with the help of proteins called pumps. The transport of water across the membrane is passive (movement along the concentration gradient) and is with the help of channel proteins known as aquaporins.

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