Which of the following is (are) stage(s) in the life
cycle of Obelia, a cnidarian?
a. medusa
b. planula
c. polyp
d. zygote
e. all of these
Answer: e
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Which of these methods can be used to determine the number of viable microorganisms in a sample?
A. Light scattering in a spectrophotometer B. Counting a known volume of cells in a hemocytometer C. Measuring colony forming units per ml D. Measuring total cell mass
When solutes are unloaded from phloem, water ____
a. is pumped into the phloem by active transport b. leaves the xylem by osmosis c. moves into the phloem by facilitated diffusion d. is pumped out of the phloem by active transport e. leaves the phloem by osmosis
In a scientific experiment, the group that does not receive the experimental treatment is called the placebo group
a. true b. false
Which of the following poxviruses are zoonoses?
A) molluscum contagiosum B) smallpox C) cowpox D) monkeypox E) both cowpox and monkeypox