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

The membrane of the thylakoid is shown below in Figure 2 in the image. What is energizing the electrons as they move across the photosynthetic electron transport chain?  

Some bacteria can perform photosynthesis.

The image below is an organelle that performs photosynthesis. Which of the following molecules is a reactant in the light dependent reactions? (Hint: it comes into the thylakoids and is split to begin the light dependent reactions. This is Molecule 1 in Figure 1).

Figure 5 below depicts a cross section of an organelle responsible for photosynthesis. What is Structure 2 in Figure 5?

Anaerobic cellular respiration means respiration that does NOT require oxygen.

Oxidation and reduction are important processes involved in cellular respiration and photosynthesis. Imagine there is a molecule of NAD+ that enters cellular respiration; it comes into glycolysis and becomes NADH when it exits the process. NAD+ absorbed two electrons, was it oxidized or reduced? (Hint: remember OIL RIG).

All cells have mitochondria.

Figure 9 below depicts a part of mitosis. What is structure 4 in the image?

49.  A 45-year-old male presents with a productive cough lasting 2 weeks, dyspnea, and wheezing. He has no history of cardiopulmonary disease. What is the most likely diagnosis?