Activity week 3 with answer

Activity week 3 with answer - Photons can excite electrons...

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Activity: Week 3 1. Name two processes that can be driven by proton motive force. These are the 3 main processes mentioned in lecture. Life can drive many other processes not covered in lecture. Producing ATP when protons flow through ATPase (ATP making “machine,” an enzyme). Also, flagellar propulsion and molecular transport probably against gradient as shown in Lecture 5, page 5. 2. What is one major difference between mammalian and bacterial respiration? There are many possible differences, but one major difference discussed in lecture is the final electron acceptor is O2 for mammals and bacteria not only can use O2, but they have other choices. 3. Protons are concentrated in the ________ intermembrane space _________ of the mitochondria, and create ___ ATP ____ when it flows down its gradient. 4. What is one way of capturing light energy?
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Unformatted text preview: Photons can excite electrons on chlorophyll. The excited electron can be passed along ETC and power proton pumps to form PMF. The PMF can make ATP. 5. What is one way of storing captured light energy? The energy that is captured as described in question 4 can be stored transiently in ATP or NAD(P)H. But, for longer term storage, the energy is stored by reducing carbon or carbon fixation via the Calvin Cycle. Using CO2 to form sugar. 6. Dinitrophenol (DNP) is a membrane-soluble weak acid that can shuttle protons across a biological membrane, and is considered as a metabolic poison. a. How would this chemical affect aerobic respiration? This poison will destroy the PMF, so little to no ATP can be formed from ETC and from NADH->NAD+. b. How about photosynthesis? Also destroys PMF, no ATP formed from electron excitement....
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