1. B 2. c. 3. B and im not sure about the other two
Answer:
Enzymes are biological catalysts that increase the rate of chemical reactions inside cells by lowering the activation energy required for the reaction to proceed. In nature, exergonic reactions do not require energy beyond activation energy to proceed, and they release energy.
In photosynthesis, a thylakoid is a sac located in a chloroplast which absorbs light in the form of photons through proteins called Photosystems I and II and cytochrome complexes and uses it to harvest ATP. All of this occurs during the light reaction step of photosynthesis on the membranes of the thylakoids.