Which of the following serve as examples of morphological convergence?
a. sharks, penguins, and porpoises
b. panthers and tigers
c. apes and monkeys
d. sharks, skates, and rays
e. mice, rats, and gerbils
ANSWER: a
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A person who is infected with a potential pathogen fails to develop signs or symptoms of disease. This correlates with ________ initial microbial dose, ________ microbial lethality, and/or ________ replication rate of the pathogen.
A. low; high; low B. low; low; high C. high; low; high D. high; low; low
Which protective structure forms to protect certain bacteria during periods of harsh conditions?
A. Biofilm B. Capsule C. Flagella D. Endospore
From which germ layer(s) do(es) the stomach arise?
a. ectoderm only b. endoderm only c. mesoderm only d. mesoderm and endoderm e. endoderm and ectoderm
The main route for transmission of HIV in most parts of the world is through
A. intravenous drug use. B. homosexual sex. C. blood products. D. heterosexual sex. E. blood transfusion.