Question

1. what is active transport? what are the three types of active transport and how do they work?

Explanation:

Active transport is the movement of molecules or ions across a cell - membrane from an area of lower concentration to an area of higher concentration against the concentration gradient, requiring energy (usually in the form of ATP). The three types are primary active transport, which directly uses energy (ATP) to move substances; secondary active transport, which uses the energy stored in an electrochemical gradient established by primary active transport to move other substances; and group - translocation, where a substance is chemically modified during its transport across the membrane.

Answer:

Active transport is the movement of substances against a concentration gradient using energy. The three types are primary active transport (uses ATP directly), secondary active transport (uses energy from an established gradient), and group - translocation (chemical modification during transport).