Why is nitrogen fixation by prokaryotes essential to life on Earth?
a. It removes nitrogen from the soil.
b. It converts atmospheric nitrogen to a non-toxic form.
c. It provides nitrogen sources for plants and animals.
d. It provides an energy source for photosynthesis.
e. It allows for the breakdown of complex macromolecules.
ANSWER: c
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A) TC B) TH C) B7 D) CD28
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A) stroma of the chloroplast B) thylakoid membrane C) interior of the thylakoid (thylakoid space) D) outer membrane of the chloroplast
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A) the action of memory cells. B) evolution by natural selection. C) natural immunity. D) inflammation.
Why was it such a brilliant strategy for Darwin to open On the Origin of Species with a discussion of artificial selection?
What will be an ideal response?