Multiple choice

Which of the following statements characterises the transport processes in the tubules of the kidney?

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

  2. Active transport can implant a concentration gradient.

  3. Counter transport of oppositely charged molecules regulates electroneutrality.

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

  5. Active transport can invalidate an electrical gradient.
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B Correct answer
Explanation

Active transport can move charged or uncharged molecules across a membrane and thus can implant concentration gradients .

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