Ch 8: Photosynthesis Flashcards
A photon of which of these colors of light would carry the most energy
Blue
Which process is most directly driven by light energy?
Removal of electrons from chlorophyll molecules
The source of the oxygen produced by photosynthesis has been identified through experiments using radioactive tracers. The oxygen comes from __________.
water
During photosynthesis, an electron transport chain transports __________.
electrons from photosystem II to photosystem I
Glyceraldehyde-3-phosphate (G3P) is produced in the stroma of chloroplasts. Which of the following statements about this compound is most true?
All of the listed responses are correct.
What portion of the electromagnetic spectrum is most absorbed by the chlorophyll pigments in the thylakoid membranes?
Blue-violet and red light
Rubisco is __________.
the enzyme in C3 plants that first captures CO2 to begin the Calvin cycle
The Calvin cycle occurs in the __________.
stroma
In mechanism, photophosphorylation is most similar to __________.
oxidative phosphorylation in cellular respiration
Which of the following does not occur during the Calvin cycle?
Release of oxygen (does: carbon fixation, oxidation NADPH, ATP consumption, CO2 Regeneration)
How does carbon dioxide enter the leaf?
Through the stomata
Which of the following sequences correctly represents the flow of electrons during photosynthesis?
H2O → NADPH → Calvin cycle
Which of the following statements is a correct distinction between autotrophs and heterotrophs?
Autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic.
Which of the following statements correctly describes the relationship between the light reactions and the Calvin cycle?
The light reactions produce ATP and NADPH, both of which are used in the Calvin cycle.
How is photosynthesis similar in C4 plants and CAM plants?
Rubisco in not the enzyme that catalyzes the initial fixation of carbon.
The source of the oxygen produced by photosynthesis has been identified through experiments using radioactive tracers. The oxygen comes from __________.
water
During photosynthesis in a eukaryotic cell, an electrochemical gradient is formed across the ___________.
thylakoid membrane
The reactions of the Calvin cycle are not directly dependent on light, but they usually do not occur at night. Why?
The Calvin cycle requires products only produced when the photosystems are illuminated.
The most important role of pigments in photosynthesis is to __________.
capture light energy
Rubisco is __________.
the enzyme in C3 plants that first captures CO2 to begin the Calvin cycle
Why are C4 plants more suited to hot climates than C3 plants?
Unlike C3 plants, they keep fixing carbon dioxide even when the concentration of carbon dioxide in the leaf is low
Where do the electrons entering photosystem II come from?
Water
Chlorophyll molecules are in which part of the chloroplast?
Thylakoid membranes
You could distinguish a granum from a crista because the granum, but not the crista, would __________.
have photosynthetic pigments
When chloroplast pigments absorb light, __________.
their electrons become excited
In photosynthesis, plants use carbon from __________ to make sugar and other organic molecules.
carbon dioxide
What is the role of NADP+ in photosynthesis?
It is reduced and then carries electrons to the Calvin cycle.
What portion of the electromagnetic spectrum is most absorbed by the chlorophyll pigments in the thylakoid membranes?
Blue-violet and red light
