The collective term for the organisms living on or in the human body is
A) normal microbial flora.
B) fomite flora.
C) transient microbial flora.
D) pathogenic flora.
Answer: A
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Which signaling system typically involves the longest time interval between release of a signaling molecule and activation of a receptor?
A. autocrine B. juxtacrine C. paracrine D. endocrine
In 1766, Buffon suggested that certain fossil forms might be ancient versions of similar living species.
a. true b. false
What is formed by the three layers of tissue that include the endoderm, mesoderm, and ectoderm?
A) zygote B) blastocyst C) gastrula D) fetus
A cell that neither gains nor loses water when it is immersed in a solution is what?
A. hypertonic to its environment. B. metabolically inactive. C. hypotonic to its environment. D. isotonic to its environment.