The size at which a population stabilizes in a particular place is defined as the __________ for that species.
A. growth potential
B. optimum
C. range
D. carrying capacity
D. carrying capacity
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When it is important to count the number of cells, determine cell size, and differentiate between dead and live cells, a(n) ________ is used.
A. spectrophotometer B. SEM C. Coulter counter D. flow cytometer E. methylene indicator dye
Poliomyelitis is an RNA virus that can invade the nervous system and cause paralysis within a matter of hours. Polio has been virtually eliminated world-wide by which of the following?
a. Antibiotics b. Vaccination c. Mosquito control d. Quarantine e. Improve water quality
Which of the following is the most effective in
protecting against sexually transmitted diseases? a. condoms b. the Pill c. douching d. an IUD e. the rhythm method
Which of these would be an effect of an excess of thyroid hormones?
A) More thyroid hormone would be produced. B) A would release less TRH. C) B would release more TSH. D) The thyroid would swell and produce a goiter.