An r-strategist is characterized by
A) slow population growth.
B) a slow rate of development.
C) a long life expectancy.
D) density-independent mortality.
D
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Bioassays
(a) are performed in a test tube using killed cells. (b) expose a population of living organisms to a test substance. (c) are used for chemotherapy. (d) are none of the above.
Which of the following components of a virus is not encoded by its own genome?
A. capsid B. lipid bilayer of viral envelope C. spike glycoproteins of viral envelope D. bacteriophage anchoring structures E. tail fibers
Sickle cell anemia is a recessive trait in humans. In a cross between a father who has sickle cell anemia and a mother who is heterozygous for the sickle cell allele, what is the probability that all of their first three children will be unaffected?
A) 1/4 B) 1/2 C) none D) 1/8 E) 1/16
Which of the following is classified as a spongiform encephalopathy?
A) botulism B) variant Creutzfeldt-Jakob disease C) Hansen's disease D) arboviral encephalitis E) African sleeping sickness