Active Transport Concepts and Mechanisms

What is the primary characteristic of active transport?

• It moves molecules from an area of high concentration to an area of low concentration.

• It moves molecules from an area of low concentration to an area of high concentration.

• It does not require any energy.

• It only transports water molecules.

Which two components are essential for active transport to function?

• Water and sunlight

• ATP energy and transport proteins

• Oxygen and carbon dioxide

• Lipids and carbohydrates

Active transport is often compared to swimming upstream or pumping water uphill because it:

• Is a very fast process.

• Requires significant effort and energy.

• Only occurs in aquatic environments.

• Moves substances with the natural flow.

Why might a cell use active transport to move sugar into itself, even if there is already a lot of sugar inside?

• To maintain an equal concentration of sugar on both sides of the membrane.

• To prevent sugar from leaving the cell.

• To concentrate sugar inside the cell for its needs.

• To break down the sugar into smaller molecules.