Of all organisms, prokaryotes are
a. the smallest.
b. the most abundant.
c. the most metabolically diverse.
d. the most widespread.
e. all of these.
Answer: e
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Although carbon dioxide contains carbon, it is not considered an "organic" compound because ____
a. it is not found in the earth's crust b. it is not present in living cells c. the carbon atom is not bonded to at least one hydrogen atom d. the carbons are not in chains or rings e. it is too small
You are conducting a genetic screen using Caenorhabditis elegans embryos to isolate mutations affecting anaphase (A). Therefore, you need to look for embryos in which
A. the poles do not move apart. B. the spindle apparatus does not disassemble. C. the centromeres do not move toward the poles. D. sister chromatids are mismatched and therefore fail to separate.
Which type of junction forms an impermeable barrier between epithelial cells?
A cyst formed by a protist functions
A. as a protective mechanism against adverse changes in the environment. B. in transfer from one host to the next. C. in repair of damage to the cell envelope. D. as a protective mechanism against adverse changes in the environment and in transfer from one host to the next.