Passive and Active Transport Examples

In what way is molecular transport similar to facilitated diffusion?

• it requires an input of energy

• it is used to move water in and out of cells

• it involves proteins that act as channels or carriers

• it moves materials against a concentration gradieint

Which of the following is not a type of passive transport?

• diffusion

• endocytosis

• osmosis

• dialysis

Which of the following is a type of active transport?

• osmosis

• diffusion

• sodium-potassium pump

• dialysis

Which of the following will affect the rate of diffusion?

• steeper concentration gradients

• increases in temperature

• decrease in size of molecules

• all of the answers are correct

Which of the following answer choices best describes the image above?

• Passive transport; no energy input; facilitated diffusion; with the concentration gradient

• Passive transport; no energy input; simple diffusion; with the concentration gradient

• Active transport; energy input; facilitated diffusion; against the concentration gradient

• Passive transport; energy input; simple diffusion; with the concentration gradient

Based on this image, which of the following statements is true?

• The molecules will move from an area of low concentration to an area of high concentration without any energy input.

• The molecules will move from an area of high concentration to an area of low concentration without any energy input.

• The molecules will move from an area of high concentration to an area of low concentration due to an input of energy.

• The molecules will move down the concentration gradient and once at equilibrium, will no longer move across the membrane.

Which of the following statements about passive transport is true?

• Substances move along their concentration gradients.

• Energy input is required.

• Membrane proteins are always needed.

• Passive transport refers only to the movement of water.

When a patient is admitted to the hospital and needs to be placed on intravenous (IV) fluids, its important that these fluids are at an isotonic (equal in concentration) concentration to their own body's fluids.

If the saline (salt) concentration of the body's fluids is 0.9

percent, what should be the concentration of IV saline solution administered to a patient?

• 0.9%

• greater than 0.9%

• less than 0.9%

Which way do particles move during active transport?

• From areas of high concentration to areas of low concentration

• From one area of low concentration to another area of low concentration

• From one area of high concentration to another area of high concentration

• From areas of low concentration to areas of high concentration

The rate of diffusion through a semipermeable membrane will be lowest when which of the following is (are) true?

I. Concentration gradients are steep

II. Temperatures are low

III. Solutes are small molecules

• I only

• II only

• I and III only

• II and III

• I, II, and III