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Which of the following are NOT examples of passive transport in cells?

Choose TWO (2) answers.
A. Channel and carrier proteins assist molecules that cannot easily move across cell membranes on their own.
B. Our intestines extract vitamins and minerals from food through facilitated diffusion.
C. Charged ions need energy such as ATP to be transported across the cell membrane.
D. A plant vacuole in a wilted plant cell increases in volume after the plant is watered causing the plant to no longer wilt.
E. An amoeba (a protist without a cell wall) pumps out excessive water with its contractile vacuole in order to maintain a balance of water

User Thedude
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Final answer:

Options C and E are not examples of passive transport. Option C refers to active transport of charged ions using ATP, and option E describes how an amoeba actively pumps out water using its contractile vacuole, which requires energy.

Step-by-step explanation:

To determine which options are not examples of passive transport in cells, we need to understand what passive transport is. Passive transport is the movement of substances across a cell membrane without the input of cellular energy, generally along a concentration gradient from an area of higher concentration to an area of lower concentration. This includes processes such as diffusion, osmosis, and facilitated diffusion.

The options that are NOT examples of passive transport are those that require energy, such as ATP, to move molecules across the cell membrane. Therefore, the following two options indicate processes that are not passive transport:

  • C. Charged ions need energy such as ATP to be transported across the cell membrane. - This is describing active transport because it requires energy to move ions against their concentration gradient.
  • E. An amoeba (a protist without a cell wall) pumps out excessive water with its contractile vacuole in order to maintain a balance of water. - This process also involves energy usage to move water against the gradient, characterizing it as active transport rather than passive.

The other options, A, B, and D, describe processes that align with passive transport mechanisms. For example, facilitated diffusion (B), which uses protein channels without the input of ATP, and the natural osmotic process that occurs when the plant vacuole increases in volume after the plant is watered (D).

User Junho
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