Compare and contrast carbon fixation and nitrogen fixation.
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Both processes convert inorganic compounds into organic forms that living things can use.
Carbon fixation can take place in the presence or absence of oxygen. Both prokaryotes and eukaryotes capable of fixing carbon, incorporating carbon dioxide (CO2) into carbohydrate molecules (glucose).
Nitrogen fixation can only occur in the absence of oxygen, and only prokaryotes carry out nitrogen fixation. Nitrogen fixation reduces nitrogen gas (N2) to produce ammonia (NH3).
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Generally, vitamin and mineral supplements are
essential only for a. strict vegetarians. b. the elderly. c. the chronically ill. d. those taking certain medications. e. all of these.
At one time, the pituitary was known as the ‘master gland’. Explain why this name is both fitting and misplaced. What will be an ideal response?
How is an integrated retroviral provirus structured like a transposon?
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A genome can be best described as
A) a segment of DNA that encodes an RNA or a protein. B) an organized package of DNA and proteins. C) a single pair of nucleotides connected by hydrogen bonds. D) the DNA in all chromosomes in a cell.