Why isn't oxygen produced by organisms that perform anoxygenic photosynthesis?
a. their photosystems do not utilize the Calvin cycle
b. they use a different enzyme for the initial reactions of the Calvin cycle
c. they use electron donors other than water
d. their membranes lack ATP synthase
e. their chlorophyll contains an iron center rather than magnesium
ANSWER: c
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Robert Hooke coined the term cell when studying thin slices of cork. These ________ were the first cells observed because ________
A) dead plant cells; the thick cells walls did not require high resolution or magnification to view B) dead animal cells; they were immobile and did not need to be fixed before viewing C) compartments; they were actually the result of multiple cells that had merged and died to form large compartments that were easy to view D) immune cells; they produce antibodies that embed in the cell membrane to make it visible E) "little rooms"; they were 100 nm in diameter, much larger than most plant cells
The production of antibodies that results from the entrance of a foreign object such as a virus or bacterium, into the bloodstream of a host is referred to as
A) allelopathy. B) a behavioral response. C) an inflammatory response. D) an immune response.
Each of the following activates a receptor tyrosine kinase except
A) EGF. B) PDGF. C) TGF? D) FGF. E) Insulin.
carbon cycle: photosynthesis
What will be an ideal response?