Scientists have proposed a number of mechanisms by which the xylem carries water to the tops of the highest trees. Which of the proposed mechanisms is the correct one?

a. capillary action
b. guttation
c. transpiration
d. root pressure
e. xylem pumps


C

Biology & Microbiology

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Assuming that aerobic metabolism starts with glucose as its fuel, approximately _____% of the energy of the starting molecules will be captured in a useful form. The remaining energy will be converted to _____ and will be either lost or used to _____

A. 42; heat; warm the animal B. 42; electricity; keep the circulatory system functioning C. 58; heat; warm the animal D. 75; light; carry out photosynthesis E. 42; light; carry out photosynthesis

Biology & Microbiology

Persons infected with HIV often die of opportunistic diseases because

A. HIV can transduce other viruses into virulent strains. B. HIV destroys T cells. C. HIV binds to antibodies. D. HIV is a retrovirus. E. HIV mutates easily.

Biology & Microbiology

The genetic variability of a population is solely dependent on the generation of mutations

a. True b. False Indicate whether the statement is true or false

Biology & Microbiology

Which molecule(s) regulate(s) photosynthesis by sensing the metabolic status of the chloroplast and regulating proton

flow out of the thylakoid lumen?

a. ATP synthase b. chlorophyll a c. chlorophyll b d. carotenoids e. the antenna complex

Biology & Microbiology