Cyclic electron flow may be photoprotective (protective to light-induced damage). Which of the following experiments could provide information on this phenomenon
A. Using mutated organisms that can grow but that cannot carry out cyclic flow of electrons and compare their abilities to photosynthesis in different light intensifies
B. Using plants that can carry out both linear and cyclic electron flow, or only one or another of three processes, and measuring their light absorbable
C. Using bacteria that have only cyclic flow and look for their frequency of mutation damage
D. Using bacteria with only cyclic flow and measuring the number and the types of photosynthetic pigments they have in their membranes
E. Using plants with only photosystem I operative and measure how much damage occurs at different wavelengths
Answer: A
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AP Biology Chapter 10
- You have isolated a previously unstudied protein, identified its complete structure in detail and determined that it catalyzes the breakdown of a large substrate. You notice it has two binding sites. One of theses is large, apparently the bonding site for the large substrate; the other is small, possibly a binding site for a regulatory molecule. What do these finding tell you about the mechanism of this protein?
- With respect to the enzyme that converts X to Y, substance A functions as _____.
- What is substance X?
- In the figure, why does the reaction rate plateau at higher reactant concentrations?
- A noncompetitive inhibitor decreases the rate of an enzyme reaction by____.
- According to the induced fit hypothesis of enzyme catalysis, ______.
- The lock-and-key analogy for enzymes applies to the specificity of enzymes____.
- Which of the following is true of enzymes?
- What compound provides the reducing power for Calvin cycle reactions?
- Which of the following does NOT occur during the Calvin cycle?
- Which of the following sequences correctly represents the flow of electrons during photosynthesis?
- Refer to the figure. If the carbon atom of each of the incoming CO2 molecules is labeled with a radioactive isotope of carbon, which organic molecules will be radioactively labeled after one cycle?
- In the process of carbon fixation, RuBP attaches a CO2 to produce a six-carbon molecule, which is then split to produce two molecules of 3-phosphoglycerate. After phosphorylation and reduction produces G3P, what more needs to happen to complete the Calvin cycle?
- What is the primary function of the Calvin Cycle?
- Where does the Calvin cycle take place?
- Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin Cycle?
- Which process is most directly driven by light energy?
- In a plant, the reactions that produce molecular oxygen (O2) take place in_____.
- Which of the following statements best describes the relationship between photosynthesis and respiration?
- In mitochondria, chemiosmosis moves protons from the matrix into the intermembrane space, whereas in chloroplasts, chemiosmosis moves protons from the ____.
- In a plant cell, where are the ATP synthase complexes located?
- What are the products of linear electron flow?
- Which of the following are directly associated with photosystem I?
- In the thylakoid membranes, the pigment molecules in a light-harvesting complex_____.
- The electrons of photosystem II are excited and transferred to electron carriers. From which molecule or structure do the photosystem II replacement electrons come?