The process of adding hydrogen to N2, creating NH3 and eventually NH4
+, and which requires a
substantial input of ATP, is called
a. nitrification.
b. ammonification.
c. nitrogen cycling.
d. nitrogen fixation.
e. nitrogen assimilation.
D
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The relationship between photosystem I (PSI) and photosystem II (PSII) is correctly described by which of the following statements?
A) PSI absorbs only short wavelengths of light. B) Electrons are excited by PSI or PSII, but not both. C) PSI is designated P700, whereas PSII is designated P680. D) The absorption maximum of PSII is 700 nm. E) The absorption maximum of PSI is 680 nm.
Oxidative phosphorylation is the process by which ____
a. high energy NADH is made to supply the cell with its needed energy b. a final electron acceptor is used indirectly to facilitate the production of ATP c. ATP is made using high energy intermediates of cellular respiration d. specific enzymes are regulated to control cellular respiration e. NAD+ is regenerated to allow glycolysis to continue
Early in the infection with HIV, most virions bind to the host cell using CCR5 as a coreceptor. As the infection progresses, the HIV population evolves to use an alternate coreceptor. What is the alternate coreceptor these X4 viruses utilize?
A) Tetherin B) CCR5? C) vpu D) TRIM5? E) CXCR4
Fungal diseases include all of the following EXCEPT
A. oral thrush. B. ringworm. C. athlete's foot. D. strep throat (pharyngitis).