BIO 1406/07 W/CONNECT/LM NEW >IC<
16th Edition
ISBN: 9781260075762
Author: Raven
Publisher: MCG CUSTOM
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Textbook Question
Chapter 8, Problem 6A
Given that the C4 pathway gets around the problems of photorespiration, why don’t all plants use it?
a. It is a more recent process, and many plants have not had time to evolve this pathway.
b. It requires extra enzymes that many plants lack.
c. It requires special transport tissues that many plants lack.
d. It also has an energetic cost.
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Students have asked these similar questions
Some plants are able to survive in hot, dry climates like the desert. What is the name of their photosynthetic process?
A. Noncyclic photophsophorylation
B. C4 Photosynthesis
C. C3 Photosynthesis
D. Carbon fixation
What is the BEST explanation for why thylakoid membranes are flat and stacked?
A. to fit more into a chloroplast
B. to increase surface area for light absorption and cross-
membrane traffic
C. to increase the color of the leaf as camouflage from herbivores
D. to hold more ATP
The denaturation temperature of rubisco in a certain plant was determined to be 76.2 degrees Celsius. What happens to the rate of photosynthesis if the temperature continues to increase?
A.
The rate of photosynthesis will increase.
B.
The rate of photosynthesis will decrease.
C.
The rate of photosynthesis will remain the same.
D.
The rate of photosynthesis will decrease, then increase.
Chapter 8 Solutions
BIO 1406/07 W/CONNECT/LM NEW >IC<
Ch. 8 - The light-dependent reactions of photosynthesis...Ch. 8 - Which region of a chloroplast is associated with...Ch. 8 - The colors of light that are most effective for...Ch. 8 - During noncyclic photosynthesis, photosystem I...Ch. 8 - How is a reaction center pigment in a photosystem...Ch. 8 - The ATP and NADPH from the light reactions are...Ch. 8 - The carbon fixation reaction converts a. inorganic...Ch. 8 - C4 plants initially fix carbon by a. the same...Ch. 8 - Prob. 1ACh. 8 - If you could measure pH within a chloroplast,...
Ch. 8 - Prob. 3ACh. 8 - If the Calvin cycle runs through six turns a. all...Ch. 8 - Prob. 5ACh. 8 - Given that the C4 pathway gets around the problems...Ch. 8 - If the thylakoid membrane became leaky to ions,...Ch. 8 - The overall process of photosynthesis a. results...Ch. 8 - Compare and contrast the fixation of carbon in C3,...Ch. 8 - Diagram the relationship between the reactants and...Ch. 8 - Do plant cells need mitochondria? Explain your...
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- Which of the following options best explains how less chlorophyll would affect the proces of photosynthesis in plants? 6. A. It would increase the rate of photosynthesis because of the increased production of food. B. It would limit the amount water plants are able to take in, resulting in a slower rate of photosynthesis. C. It would increase the production of oxygen because the plant would need to work hard to feed themselves. С. D. It would limit the amount of light absorbed by the plant and decrease the amount of food the plant is able to produce for itself.arrow_forwardIf you reduced the density of chlorophyll molecules in a plant by 50%, and as a result chlorophyll molecules were now too far apart for any resonance energy transfer to occur, what would be the most likely impact on the amount of photosynthesis the plant could carry out? a. reduced, by 25% b. reduced by 50% c. reduced by 75% d. reduced by 100%arrow_forwardWhich statement best explains the relationship between the amount of sunlight a plant receives and the flow of energy into and out of the plant system? A An increase in the amount of sunlight adds more energy to the system and increases the rate of photosynthesis. B An increase in the amount of sunlight removes energy from the system and decreases the rate of photosynthesis. C A decrease in the amount of sunlight removes energy from the system and increases the rate of photosynthesis. D A decrease in the amount of sunlight adds more energy to the system and decreases the rate of photosynthesis.arrow_forward
- Plants where light independent reactions take place in the same cells as light dependent reactions (mesophyll cells) are using which kind of photosynthesis? A. C3 only B. C4 only C. Either C3 or CAM D. Either C3 or C4arrow_forwardHow is the proton gradient of H+ generated in chloroplasts during photosynthesis? A. Light splits water molecules in the stroma, causing the release of protons. B. Protons are pumped across the thylakoid membrane using energy from ATP. C. Light causes protons to flow through protein channels in the thylakoid membrane. D. The flow of electrons from carrier to carrier in the thylakoid membrane causes the pumping of protons.arrow_forwardThe figure below shows the concentration of glucose for a 24-hour period on both the process of photosynthesis (blue) and cellular respiration (red dashed lines). What explains the increase of respiration rate during the day? a. Enzymes are active during the day. b. Glucose production has increased due to photosynthesis. c. More energy is required to transport water and phloem sap and to dissipate heat. d. All of the above.arrow_forward
- In the carbon reduction phase of the Calvin cycle, electrons from NADPH are donated to a metabolic intermediate to form G3P molecules. Which statement is NOT true regarding G3P? A. G3P molecules are involved in the regeneration of RuBP. B. G3P molecules affect the activity of the enzyme rubisco. C. G3P molecules have more potential energy than PGA molecules. D. G3P molecules are used to synthesize glucose and other sugars.arrow_forwardWhich of the following is the role of iron in plants? A. endosperm development and dehydrogenase activity B. photodestruction of chlorophyll and chloroplast structure C. energy transferring process for photosynthesis and respiration D. regulatory component of proteins and metabolites in roots and leavesarrow_forwardHow are the NADPH and G3P molecules made during photosynthesis similar? a. They are both end products of photosynthesis. b. They are both substrates for photosynthesis. c. They are both produced from carbon dioxide. d. They both store energy in chemical bonds.arrow_forward
- Which is NOT an evolutionary adaptation of plants to minimize the costs of photorespiration while also conserving water on hot days? a. Use more ATP to incorporate CO2 into organic compounds, which increases CO2 concentration in the cell. b. Confine the Calvin cycle to specific cells in order to prevent inefficient rubisco binding and net energy loss. c. Binding O2 to rubisco instead of CO2. d. Uptake CO2 only at night and use ATP to fix it into organic acid for later use during the light reactions, which prevents water loss during the day.arrow_forwardPropose a hypothesis on how each of these variables affects the production of oxygen from a plant. 1. Increasing light intensity 2.Increasing CO2 levels 3.Increasing temperature 4.How does light intensity affect the rate of photosynthesis?arrow_forwardPhotorespiration becomes more likely when a. CO2 concentrations are high in leaf cells. b. stomata remain closed in C3 plants. c. glucose concentrations are low in leaf cells. d. ATP binds to rubisco.arrow_forward
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