Questions: Question 7 Which of the following transport mechanisms requires energy Osmosis Antiports Diffusion Facilitated diffusion

The answer is the second one: Antiports.

Explanation for each option:

1. Osmosis: This is a passive transport mechanism where water molecules move across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration. It does not require energy.

2. Antiports: This is a type of active transport mechanism where two substances are moved across a membrane in opposite directions. It requires energy, usually in the form of ATP, to function.

3. Diffusion: This is a passive transport mechanism where molecules move from an area of higher concentration to an area of lower concentration. It does not require energy.

4. Facilitated diffusion: This is also a passive transport mechanism where molecules move across a membrane through protein channels from an area of higher concentration to an area of lower concentration. It does not require energy.

In summary, antiports require energy because they are involved in active transport, unlike the other options which are passive transport mechanisms.