What is structure 3 in Figure 7 called?

Aerobic cellular respiration means respiration that requires oxygen.

What is structure 1 in Figure 7 called?

In reference to Figure 3, the H+ ions are moving from high concentration to low concentration across the membrane through ATP Synthase (a protein). What type of transport is this, and does this require energy to occur?  

Figure 10 below represents a cross-sectional view of onion cells under the microscope, similar to what we were able to observe in our Cell Cycle Lab activity. What phase of the cell cycle is cell sample 2 likely in?

What is the name of the outermost layer of a gastrula?  

Figure 5 below depicts a cross section of an organelle responsible for photosynthesis. What is Structure 4 in Figure 5?

What is the name of the innermost layer of a gastrula?  

Which of the following are the REACTANTS in aerobic cellular respiration?

In reference to Figure 3, what is the BEST benefit to oxygen (O2) in the electron transport chain?