Hereditary nonpolyposis colon cancers (HNPCC) ____
a. are rare in the United States, but common in Europe
b. begin with a mutation in the APC gene
c. are caused by one-of-a-kind DNA sequences called microsatellites
d. are caused by one mutation in a single gene
e. are caused by several mutations in several different genes
e
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Degenerative joint disease (DJD) commonly affects the knee joints because ___________
Fill in the blank(s) with the appropriate word(s).
The environment immediately surrounding an individual cell is called its
A. macroenvironment. B. microenvironment. C. microniche. D. colony.
Cells produced on the inside of the vascular cambium differentiate to form which vascular tissue?
a. cork cambium b. primary phloem c. primary xylem d. secondary phloem e. secondary xylem
Which of the following is one function of the developing follicle?
a. to secrete gonadotropin-releasing hormone b. to stimulate ovulation c. to secrete progesterone d. to secrete estrogens