Which of the following is true of carcinomas?
a) They constitute <1% of tumors seen in Western clinics
b) They typically involve epithelial cells of origin
c) They arise mainly from the mesoderm
d) All of the above
Answer: b) They typically involve epithelial cells of origin
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Which of the following describes a function of the cell wall in prokaryotic cells?
a. preventing osmotic lysis b. facilitating mitosis c. ensuring sufficient nutrient flow d. protecting the hydrothermal vent
The female hormone that participates in milk production is _____ and the hormone that facilitates delivery is _____
a. prolactin; oxytocin b. prolactin; estrogen c. prolactin; progesterone d. oxytocin; estrogen e. oxytocin; progesterone
Most of the body's muscle tissue is
a. smooth muscle. b. skeletal muscle. c. cardiac muscle. d. involuntary muscle. e. digestive muscle.
If a behavior has evolved by natural selection, it must have ________.
A. evolved the same way in each species B. a genetic basis C. reduced the predation rate on the animal D. benefits for both males and females