A country whose age structure diagram has a base smaller than most of the next higher levels is experiencing
A) a population explosion.
B) near zero population growth.
C) negative population growth.
D) logistic growth.
E) exponential growth.
Ans: D) logistic growth.
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A newly discovered unicellular microbe has a nucleus containing linear chromosomes and surrounded by a membrane. It has mitochondria, 80s ribosomes, and is covered by cilia. There is no cell wall external to the plasma membrane. This organism most likely would be a/an
A. bacterium. B. protozoan. C. fungus. D. archaeon. E. algae.
Select the best response to the question. ? ?Which of the following patients presenting with diarrhea is at high risk of having ?Clostridium difficile ?colitis?
A) a patient who ate contaminated food B) a patient taking antibiotics for pneumonia C) a patient who recently traveled to South America D) a patient taking high doses of anti-inflammatory medications
The most important function of sexual reproduction is
A) limiting genetic recombination. B) preserving genetic purity. C) creating genetic variability. D) producing offspring identical to the parents. E) keeping the genes from changing.
The medium in the primary explant contains PBS made 0.5 % with trypsin and 3mM with MgCl2.
a. true b. false