Multiple choice

Which among the following statements concerning transport processes in the tubules is correct?

  1. Water molecules can be pumped directly by active transport.

  2. Active transport delays concentration gradient.

  3. Counter-transport of oppositely charged molecules can maintain electroneutrality.

  4. Water moves by osmosis from a region of high osmolality to a region of low osmolality.

  5. Active transport can establish an electrical gradient.
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E Correct answer
Explanation

Active transport can move charged or uncharged molecules across a membrane and so can establish concentration gradients and if the molecules are charged, electrical gradients. However, if the charges are of opposite sign, then one side of the membrane will become more positive and the other side will become more negative.

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