ScienceBiologyBIOL Ch 7 Mastering Bio
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BIOL Ch 7 Mastering Bio

Yusra Clark avatar Yusra Clark
11 September 2022
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question
Which of these equations best summarizes photosynthesis? A. C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + Energy B. C6H12O6 + 6 O2 → 6 CO2 + 12 H2O C. 6 CO2 + 6 H2O → C6H12O6 + 6 O2 D. 6 CO2 + 6 O2 → C6H12O6 + 6 H2O E. H2O → 2 H+ + 1/2 O2 + 2e-
answer
C. 6 CO2 + 6 H2O → C6H12O6 + 6 O2
question
Where does the Calcin cycle occur?
answer
It occurs in the Stroma
question
The light reactions of photosynthesis use _____ and produce _____.
answer
water ... NADPH
question
Which term describes ATP production resulting from the capture of light energy by chlorophyll?
answer
Photophosphorylation **The excitation of chlorophyll by light energy initiates a chain of events that leads to ATP production.
question
True or false? The chemiosmotic hypothesis states that the synthesis of ATP generates a proton gradient that leads to electron flow through an electron transport chain.
answer
False **The chemiosmotic hypothesis states that the flow of electrons through an electron transport chain generates a proton gradient that leads to the synthesis of ATP
question
According to the chemiosmotic hypothesis, what provides the energy that directly drives ATP synthesis?
answer
Proton gradient **A proton gradient across chloroplast and mitochondrial membranes drives ATP synthesis by the enzyme ATP synthase
question
Which of the following particles can pass through the ATP synthase channel?
answer
Protons
question
True or false? The region of ATP synthase that catalyzes the production of ATP from ADP and inorganic phosphate spans the chloroplast membrane.
answer
false **The region of ATP synthase that catalyzes ATP production protrudes out of, but does not span, the chloroplast membrane; the region that spans the membrane is an ion channel through which protons can pass.
question
Chloroplast membrane vesicles are equilibrated in a simple solution of pH 5. The solution is then adjusted to pH 8. What conclusions can be drawn from these experimental conditions?
answer
ATP will not be produced because there is no ADP and inorganic phosphate in the solution.
question
Which process produces oxygen? Cellular Respiration or Photosynthesis?
answer
Photosynthesis
question
Which set of reactions uses H2O and produces O2? Light-independent reactions or light dependent reactions
answer
light dependent reactions
question
What is the importance of the light-independent reactions in terms of carbon flow in the biosphere?
answer
The light-independent reactions turn CO2, a gas, into usable carbon in the form of sugars. **CO2 is unusable until plants have "fixed" this carbon into sugar.
question
True or false? The light-dependent reactions of photosynthesis use water and produce oxygen.
answer
true **The water molecules are split to replenish electrons in photosystem II, leaving behind protons, which are used to generate a proton gradient for the formation of ATP, and oxygen, which is released as a by-product.
question
Which of the following molecules is the primary product of photosystem I? A. ATP B. Oxygen C. NADPH D. Carbon Dioxide
answer
C. NADPH
question
What is the biological significance of the light-independent reactions of photosynthesis?
answer
They convert carbon dioxide to sugar.
question
Describe the relationship between the light-dependent and light-independent reactions of photosynthesis?
answer
The light-dependent reactions produce ATP and NADPH, which are then used by the light-independent reactions.
question
Which of the following reactions ensures that the Calvin cycle can make a continuous supply of glucose? A. Carbon fixation B. Production of 3-phosphoglycerate C. Production of G3P D. Regeneration of RuBP
answer
D. Regeneration of RuBP
question
Select the correct molecule that is the main product of the Calvin cycle. A.G3P B. Glucose C. NADPH
answer
A. G3P
question
What is the basic role of CO2 in photosynthesis? A. CO2 is fixed or incorporated into organic molecules. B. CO2 is a source of electrons in the formation of organic molecules. C. CO2 is taken in by plants as a form of inverse respiration, in which carbon dioxide is "breathed in" and oxygen is "breathed out."
answer
A. CO2 is fixed or incorporated into organic molecules.
question
Describe the basic function of the light reactions of photosynthesis.
answer
The basic function of the light reactions of photosynthesis is the conversion of solar energy to chemical energy.