A 13-year-old girl presented to her physician complaining of being tired, having a mild sore throat and fever. She appears to have a grey coating on her tonsils when examined by the physi-cian. The most logical etiologic agent associated with the patient's illness is:
a. Streptococcal pharyngitis.
b. diphtheriae.
c. scarlet fever.
d. Tonsillitis.
B
C. diphtheriae causes a mild sore throat. Toxigenic strains cause tissue necrosis resulting in a grey pseudomembrane in the oral pharynx of the patient.
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To reproduce sexually, bryophytes require
A. heterospory. B. free water external to the plant. C. high temperatures. D. solar energy. E. insect pollination.
Bacterial vaginosis is always caused by sexual transmission.
Answer the following statement true (T) or false (F)
A pregnant mouse is exposed to high levels of a chemical. Many of the mice in her litter are deformed, but when they are interbred with each other, all their offspring are normal. Which two of the following statements could explain these results?
(a) In the deformed mice, somatic cells but not germ cells were mutated. (b) The original mouse's germ cells were mutated. (c) In the deformed mice, germ cells but not somatic cells were mutated. (d) The toxic chemical affects development but is not mutagenic.
The _______________ is the study of what happens to all the alleles in a population
A. Macroevolution B. Microevolution C. Adaption D. Population genetics