Most atmospheric oxygen comes from photosynthesis. From which of the following molecules is the oxygen derived?
A. water
B. carbon dioxide
C. glucose
D. chlorophyll a
E. chlorophyll b
A. water
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When people die from HIV infections, it is usually because they _____
A) have too many HIV particles in their lymphatic system, which causes it to shut down B) have too few T cells to adequately fight infection C) have too many T cells, and this overwhelms their immune systems D) divert too much energy toward replicating the virus
B cells react with antigens through TCR antigen receptors
Indicate whether the statement is true or false.
True or False: not all photosynthetic organisms are plants, but one thing they all have in common is that they can only be found within a narrow temperature and moisture range
A. true B. false
Which of the following solutes would NOT
leave the vertebrate body under normal conditions? a. uric acid b. ammonia c. urea d. carbon dioxide e. glucose