In Which of the Following Cases is Energy NOT Needed

Question

In which of the following cases is energy NOT needed for transmembrane transport?
A)Lysine moves into the cell against its concentration gradient via the Na⁺/lysine symporter.
B)Potassium ions (K⁺)move out of the cell down the K⁺ concentration gradient via potassium channels.
C)Glucose moves into the cell down its concentration gradient via a glucose uniporter.
D)The second and third answers are correct.
E)all of the above

Accepted Answer

Energy is not required for transport processes that move substances down their concentration gradients, such as in options B (potassium ions moving out of the cell via potassium channels) and C (glucose moving into the cell via a glucose uniporter). These processes rely on passive transport mechanisms.