Ter 9 Test What BEST describes the roles of photosystem I and photosystem ll in the process of photosynthesis?
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A. They form ATP as hydrogen ions cross the thylakoid membrane.
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B.
They absorb sunlight and distribute the energy as heat.
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C. They transfer electrons from a series of intermediates to form NADPH.
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D. They absorb sunlight and transfer the energy to electrons.

What material did the moon come from?

Which of the following is a true statement? question 8 options: populations can't evolve, only individual organisms. individuals have adaptations that can change over time. individuals have traits that may or may not make them successful at reproduction. individuals evolve to have adaptations.

1. an enzyme is considered a(n) because it speeds up a chemical reaction without being used up.2. in a catalyzed reaction, a reactant is often called a(n) . an enzyme is specific because the shape of its matches only particular reactants.4. an enzyme speeds up reactions by lowering the . the between an active site and its substrate often strains bonds and the reaction proceed.6. a( , which is often a vitamin, binds to an enzyme and plays a role in catalysis.7. high temperatures or changes in ph can an enzyme, causing it to lose its shape and biological activity.