Where would you most likely find fossilized remains of humans and their immediate ancestors?
a. only in relatively old rock
b. only in relatively young rock
c. only in rock formed from volcanoes
d. only in rock from the Precambrian times
e. in any rock from areas inhabited by humans
b
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The ability to smell ____
a. manifests as a 1:1 relationship between an odor and a specific receptor b. specific chemicals can indicate a possible reaction to a chemically related drug c. specific chemicals will predict the effectiveness of antidepressants d. is mediated by a family of about 400 genes e. is mediated by the synthesis of olfactory receptors in the brain
Which of the following is correct with regard to adult and embryonic stem cells?
a. Only embryonic stem cells are undifferentiated. b. Both undergo mitosis and differentiation. c. Both can differentiate into any type of cell to replace old and worn-out cells. d. Adult stem cells can only develop into a limited number of cell types.
The structures labeled "5" are
a. trichocysts. b. micronuclei. c. flagella. d. pili. e. gullet.
California's native golden trout declined after European brown trout and eastern brook trout were introduced into California's mountain streams for sport fishing. This is an example of what type of threat?
a. overharvesting b. commercial sporting c. invasive species d. endemic species e. habitat destruction