Which is a characteristic of parasites?
a. They are indiscriminate in their choice of host.
b. They inflict serious injury and kill their host.
c. Some reside inside their host, whereas others live outside their host.
d. Parasitic hosts are always animals.
e. They rarely harm their host.
ANSWER: c
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Archaea and bacteria diverged approximately:
A) 3 billion years ago. B) 2 billion years ago. C) 4 billion years ago. E) 10,000 million years ago.
Comparison of the mouse and human genomes show that overall about 5% of nucleotides have evidence of selection acting on them, as compared to 1% of sites within exons. This suggests that
a. the mouse genome evolves more quickly than the human genome. b. most changes in exons are eliminated. c. the mouse genome is more subject to neutral evolution than the human genome. d. the mouse genome evolves more slowly than the human genome. e. many sequences that do not encode polypeptide are functionally important.
Abscisic acid synthesized in the root travels to different parts of the shoot where it regulates transpirational water loss. What is the most likely way that ABA travels from the root to the various locations within the shoot?
A. sieve tubes B. from cell to cell through the plasmodesmata C. vessels and tracheids D. between cell walls
The Argyll-Robertson pupil that is fixed and small, and does not react to light but does accommodate for focusing is associated with
A. Rocky Mountain spotted fever. B. leptospirosis. C. Lyme disease. D. tertiary syphilis. E. chlamydiosis.