1 1.5 pts.) The thylakoid lumen is more (acidic/basic) than the stroma due to th
ID: 273610 • Letter: 1
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1 1.5 pts.) The thylakoid lumen is more (acidic/basic) than the stroma due to the (lower/higher) amount of protons being pumped (in/out). 2. (1 pt.) Comparing the molecules in the list below, which molecule or complex has the highest reduction potential in the light-dependent reactions of photosynthesis? a. Photosystem II (P680* b. Photosystem I (P700) c. Plastocyanin (PC) d. Cytochrome bof 3. (0.5 pts.) In order to make glucose, how many turns of the Calvin cycle are needed? 4. (0.5 pts.) True or false. The carbon used in carbon fixation comes from the air 5. (1 pt.) Why is photophosphorylation endergonic while oxidative phosphorylation is exergonic? a. Photophosphorylation occurs in the chloroplast, while oxidative phosphorylation occurs in the b. Photophosphorylation uses light to drive electron transfer, while oxidative phosphorylation uses the spontaneous oxidation of NADH and/or succinate to drive electron transfer Photophosphorylation uses ATP, while oxidative phosphorylation produces ATP Photophosphorylation uses a strong reducing agent, while oxidative phosphorylation uses a weak reducing agent. c. d. 6. (0.5 pts.) What is the purpose of watering a plant? (Yes, this is addressed in the slides and in your template.) a. b. c. d. Water is the catalyst for photosynthesis. Water provides energy for photosynthesis. Water provides electrons for photosynthesis. Water makes photosynthesis go faster 7. (1 pt.) Which type of lipid molecule is primarily used for fuel/energy? a. Fatty acid b. Phospholipid c. Steroid d. TriacylglycerolExplanation / Answer
Hi Answer:
1. The thylakoid lumen is more acidic than the stroma due to the higher amount of protons being pumped in.
2. Comparing the molecules in the list below, which molecule or complex has the highest reduction potential in light-dependent reactions of photosynthesis?
Answer: Option C. Plastocyanin (PC)
Explanation: Plastocyanin is a copper-containing protein belongs to the plastocyanin family of copper-binding proteins. It is a monomeric protein having the molecular weight of 10.5 kDa and involved in electron-transfer. It has highest reduction potential in light-dependent reactions of photosynthesis as it acts as the electron transfer agent between cytochrome f photosystem II and P700+ from photosystem I. In light reactions cytochrome f acts as an electron donor while P700+ accepts electrons from reduced plastocyanin.
3. In order to make glucose, how many turns of the Calvin cycle are needed?
Answer: 6 turns of the Calvin Cycle
Explanation: To make a glucose molecule two molecules of G3P is required and each G3P is produced by the 3 cycles of Calvin cycle. Hence for making two G3P molecules (which is needed for1 glucose molecule) total 6 turns or cycles of Calvin cycle is needed.
4. The carbon used in fixation comes from the air. (False)
Explanation: The carbon fixation is the process of conversion of inorganic carbon (carbon dioxide) into organic compounds by living organisms. The most of carbon fixation took place by photosynthesis (presence of sunlight) and chemosynthesis (absence of sunlight). The majority of carbon fixation occurs in the marine environment, especially the nutrient-rich marine areas.
5. Why is photophosphorylation endogenic while oxidative phosphorylation is exergonic?
Answer: Option B. (Phosphorylation uses light to derive electron transfer, while oxidative phosphorylation uses the spontaneous oxidation of NADH and /or succinate too drive electron transfer.)
6. What is the purpose of watering plants
Answer: Option B. (Water provides energy for photosynthesis)
Explanation: Water is essential for the production of ATP during photosynthesis, which is the energy source. Plants having water and carbon dioxide produce the power of photons gathered from sunlight to complete photosynthesis.
7. Which type of lipid molecule is primarily used for fuel/ energy?
Answer: Option A. (Fatty acid)
Explanation: Fatty acids involved in many functions of the body. They are involved in oxygen transport throughout the body. And also used as fuel by providing energy to the body in the absence of glucose. The energy produced from one gram of fatty acids is approximately 9 kcal (37 kJ), compared to 4 kcal (17 kJ) for carbohydrates. Hibernating animals are a good example of utilizing fat reserves as fuel.
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