11.15 Transport across membranes

Which of the following is a characteristic of active transport?

• It requires energy in the form of ATP.

• It moves substances down their concentration gradient.

• It involves the diffusion of water molecules.

• It occurs only in plant cells.

What is the main difference between active transport and passive transport?

• Active transport does not require energy, while passive transport does.

• Active transport moves substances against their concentration gradient, while passive transport moves them down their concentration gradient.

• Active transport only occurs in animal cells, while passive transport only occurs in plant cells.

• Active transport involves osmosis, while passive transport involves endocytosis.

Which of the following is an example of passive transport?

• Sodium-potassium pump

• Endocytosis

• Facilitated diffusion

• Exocytosis

Which of the following processes is an example of active transport?

• Diffusion of oxygen into cells

• Osmosis of water through a membrane

• Uptake of glucose in the intestines

• Movement of carbon dioxide out of cells

Osmosis is a type of passive transport that specifically involves the movement of:

• Ions

• Proteins

• Water

• Glucose