What distinguishes active transport from passive transport?

Active transport moves particles from high to low concentration without energy.

Active transport moves particles from low to high concentration with energy.

Passive transport requires energy to move particles from low to high concentration.

Passive transport involves carrier proteins and energy.

Which of the following is an example of active transport in human cells?

Oxygen diffusing into the bloodstream

Sodium-potassium pump moving sodium out of the cell

Water moving through aquaporins

Glucose moving into cells by facilitated diffusion

What is the role of carrier proteins in active transport?

They bind to substances and change shape to transport them across the membrane.

They act as channels for passive diffusion of water.

They increase the concentration gradient of ions.

They prevent substances from entering the cell.

What happens to a carrier protein after it has transported a substance across the membrane?

It is destroyed and needs to be synthesized again.

It remains in the same shape and can transport another molecule.

It returns to its original shape and can transport more substances.

It is released into the cytoplasm of the cell.

How does active transport help plants in nutrient uptake from soil?

It facilitates the movement of water from the soil into plant roots.

It moves essential ions from the soil into root hair cells against the concentration gradient.

It allows for passive diffusion of nutrients into the plant.

It helps in the storage of nutrients in the leaves.

What is the primary function of active transport in epithelial cells of the small intestine?

To maintain the structure of the epithelial cells

To remove waste products from the cells

To absorb nutrients like glucose into the cells

To facilitate the movement of water out of the cells

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