Question

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

Answer 1

Passive transport of a molecule or ion depends on its ability to pass through the membrane, as well as the existence of a concentration gradient that allows the molecules to diffuse from an area of higher concentration to an area of lower concentration. Some molecules, like gases, lipids, and water, slip easily through the cell membrane, while others, like glucose, amino acids, and ions, require facilitated transport. This process does not require energy.

Step-by-step explanation:

Passive transport of a molecule or ion depends on its ability to pass through the membrane, as well as the existence of a concentration gradient that allows the molecules to diffuse from an area of higher concentration to an area of lower concentration. Some molecules, like gases, lipids, and water itself (which also utilizes water channels in the membrane called aquaporins), slip fairly easily through the cell membrane; others, including polar molecules like glucose, amino acids, and ions do not.

Some of these molecules enter and leave cells using facilitated transport, whereby the molecules move down a concentration gradient through specific protein channels in the membrane. This process does not require energy. For example, glucose is transferred into cells by glucose transporters that use facilitated transport.