All bacteria are pathogenic.
a. true
b. false
Answer: b. false
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Which of the following would be true of an epithelium specialized for exchange by diffusion (e.g., a respiratory epithelium)?
A. thin with a relatively large surface area B. thick with a relatively large surface area C. thin with a relatively small surface area D. thick with a relatively small surface area E. thin with a small surface area/volume ratio
An embryo develops rudiments of all organs by week ________ of prenatal development.
A) 8 B) 4 C) 6 D) 3
What is the primary cause of allopatric speciation?
a. Geographic separations b. Chromosomal abnormalities c. Limited natural resources d. Microevolution factors
In frogs, formation of the eye lens is induced by chemical signals from
A) cells that will become the neural plate. B) cells that are forming the inner ear. C) an outgrowth of the developing brain. D) both A and B E) both A and C