The molecule of chlorophyll a in photosystem II's reaction center is known as P680 because
a. it absorbs 680 photons per minute.
b. it absorbs photons with a wavelength of 680 nm.
c. there are exactly 680 accessory pigments in the photosystem.
d. it will generate 680 molecules of ATP per photon absorbed.
e. there are 680 electrons that can be energized by light.
B
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Gymnosperms (such as conifers) and angiosperms (such as lilies) differ in that only the angiosperms have
a. lignified transport tissues. b. leaves. c. seeds. d. fruits. e. swimming sperm.
By age 50, the basal metabolic rate is ____ what it was in childhood
a. double b. 80?85% c. 50?60% d. the same as e. 25?30%
Taste cells that respond to umami specifically interact with ____
a. sodium ions b. hydrogen ions c. quinine d. sugars e. glutamate
Each of the following statements regarding bacterial structures is correct EXCEPT:
A. Pili mediate the interaction of bacteria with mucosal epithelium B. Polysaccharide capsules retard phagocytosis C. Both gram-negative rods and cocci have lipopolysaccharide in their cell wall D. Bacterial flagella are non-antigenic in humans because they closely resemble human flagella