Question

1. how does secondary active transport differ from primary active transport? a. it uses atp directly. b. it involves the movement of water molecules. c. it does not require any energy. d. it couples the movement of one molecule down its gradient to move another against its gradient. 26. how is the energy from sunlight used in the light - dependent reactions? a. it converts glucose into oxygen. b. it excites electrons in chlorophyll, which then generates atp and nadph. c. it synthesizes glucose directly from water. d. it splits carbon dioxide into oxygen and carbon. 27. which of the following organelles is responsible for energy production in the cell? a. mitochondria b. nucleus c. ribosomes d. golgi apparatus

Explanation:

• For question 25: Primary active - transport uses ATP directly. Secondary active - transport couples the movement of one molecule down its gradient to move another against its gradient.
• For question 26: In light - dependent reactions, sunlight excites electrons in chlorophyll, which then generates ATP and NADPH.
• For question 27: Mitochondria are the power - houses of the cell and are responsible for energy production through cellular respiration.

Answer:

1. d. It couples the movement of one molecule down its gradient to move another against its gradient.
2. b. It excites electrons in chlorophyll, which then generates ATP and NADPH.
3. a. Mitochondria