Chapter 8:Photosynthesis DSM
In mechanism, photophosphorylation is most similar to
oxidative phosphorylation in cellular respiration
During photosynthesis, an electron transport chain transports
electrons from photosystem II to photosystem I
You could distinguish a granum from a crista because the granum, but not the crista, would
have photosynthetic pigments
In photosynthesis, plants use carbon from ______ to make sugar and other organic molecules
Carbon dioxide
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.
A photon of which of these colors of light would carry the most energy?
Blue
What portion of the electromagnetic spectrum is most absorbed by the chlorophyll pigments in the thylakoid membranes?
Blue--violet and red light
The most important role of pigments in photosynthesis is to
capture light energy
Which of the following sequences correctly represents the flow of electrons during photosynthesis?
H20-->NADPH-->Calvin Cycle
What is the role of NADP+ in photosynthesis?
It is reduced and then carries electrons to the Calvin Cycle.
Which of the following does not occur during the Calvin cycle?
Release of oxygen
Which process is most directly driven by light energy?
Removal of electrons from chlorophyll molecules
How is photosynthesis similar in C4 plants and CAM plants?
Rubisco is not the enzyme that catalyzes the initial fixation of carbon.
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
Which of the following correctly describes the relationship betwen the light reactions and the Calvin Cycle?
The light reactions produce ATP and NADPH, both of which are used in the Calvin Cycle.
How does carbon dioxide enter the leaf?
Through the stromata
Chlorophyll molecules are in which part of the chloroplast?
Thylakoid membranes
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
The Calvin Cycle occurs in the
stroma
Rubisco is
the enzyme in C3 plants that first captures CO2 to begin the Calvin cycle
When chloroplast pigments absorb light,
their electrons become excited
During photosynthesis in a eukaryotic cell, an electrochemical gradient is formed across the
thylakoid membrane
The source of oxygen produced by photosynthesis has been identified through experiments using radioactive tracers. The oxygen comes from
water
