Match the following descriptions to photosystem I, photosystem II, or both Descriptions: light energy excites electrons in chlorophyls energized electrons leaving this photosystem pump protons into the thylakoid energized electrons are used to form NADPH after leaving this photosystem  

During photosynthesis, which proteins(s) are involved in the movement of protons from the thylakoid lumen to the stroma? 

Which mechanisms do cells use to relay external signals during signal transduction.  Select all that apply.  Warning: you will lose points for selecting an incorrect choice.  

Which of the following cytoskeletal components is found predominantly around the cell cortex?

Which actin-binding protein allows actin filaments to branch by binding to the side of one filament and providing a polymerization point for another?

Porphyrin rings are chemical structures that:

When PQH2 transfers its electrons, the proton concentration in the thylakoid lumen:

Which of the following statements is NOT a function of microtubules?

Which of the following statements regarding glucose best describes how photoautotrophs use glucose?

The GTP bound to ______ is hydrolyzed upon polymerization.