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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

Most of the body's muscle tissue is

a. smooth muscle. b. skeletal muscle. c. cardiac muscle. d. involuntary muscle. e. digestive muscle.

Biology & Microbiology

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

Biology & Microbiology