The molecule of chlorophyll a in photosystem I's reaction center is known as P700 because
a. it absorbs 700 photons per minute.
b. it absorbs photons with a wavelength of 700 nm.
c. there are exactly 700 accessory pigments in the photosystem.
d. there are 700 molecules of NADPH generated per photon of light absorbed.
e. there are 700 electrons that can be energized by light.
B
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A community of organisms and the physical environment it occupies are known together as a(n)____
Fill in the blank with the appropriate word.
Which of the following types of work involves a change in position of the cell or a cell structure?
A) bioluminescent B) electrical C) mechanical D) synthetic E) concentration
Select all correct descriptions of the cerebral cortex.
A. region of the brain that contains reflex centers B. region of the brain that accounts for voluntary movement C. region of the brain that accounts for sensation D. region of the brain that accounts for thought processes E. convoluted outer layer of gray matter that covers the cerebral hemispheres
A culture of bacteria is fed glucose containing radioactive carbon and is then examined. During the citric acid cycle, radioactive carbon would first appear in
A) NADH. B) citrate. C) oxaloacetate. D) CO2.