Green algae are assumed to be ancestors of plants because
A) green algae are almost exclusively marine.
B) green algae make chitin and laminarin.
C) the fossil ancestors have been discovered.
D) lignin is known to occur in some green algae.
E) green algae make cellulose and starch.
E
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High temperatures increase reaction rates but lower rubisco selectivity for CO2 versus O2. High leaf temperatures thus __________
A. increase photorespiration rates B. decrease photorespiration rates C. increase respiration D. decrease RuBP carboxylation E. increase RuBP carboxylation
What percentage of microbes have been cultured in the laboratory?
A. 10% B. 1% C. 20% D. 30%
Type ________ hypersensitivity involves delayed, cell-mediated immune reactions.
A. I B. II C. IV D. III
Viruses that infect bacteria are:
a. Not known to exist b. Prions c. Bacteriophages d. Composed of protein only e. Also capable of causing disease in humans