The dorsal surface of a turtle's shell is the ________ while the ________ is the ventral surface
a. carapace; keratin
b. keratin; plastron
c. plastron; carapace
d. carapace; plastron
d
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Oomycetes ("water molds") contain ________ in their cell walls, while most fungi have ________ in their cell walls
A) cellulose / chitin B) chitin / cellulose C) silica / chitin D) cellulose / silica
Fragile X syndrome is caused by ____ on the X chromosome in humans
a. the presence of CCG repeats b. mutations within CCG repeats c. deletion of CCG repeats d. overreplication of CCG repeats e. the absence of CCG repeats
Which is NOT a result or effect of irrigation?
a. increased food production b. saltwater intrusion into water supplies c. lowered water tables d. uplifted land e. salinization
Conjugation between a bacterium that lacks an F factor (F?) and a bacterium that has an F factor on its chromosome (F+) could produce which of the following results?
A) The F? bacterium ends up carrying one or more plasmids from the F+ bacterium; the F+ bacterium is unchanged. B) The F+ bacterium ends up with a recombinant chromosome that carries some genes from the F? bacterium, and the F? bacterium ends up with an unaltered chromosome. C) The F+ bacterium ends up with a recombinant chromosome that carries some genes from the F? bacterium, and the F? bacterium ends up with a chromosome that lacks those genes. D) The F? bacterium ends up with a recombinant chromosome that carries some genes from the F+ bacterium, and the F+ bacterium ends up with an unaltered chromosome.