What do some red algae have that actually deters many herbivores?
a. They extend in elaborate branching filaments
b. They grow in dense patches.
c. They incorporate calcium carbonate into their cell walls.
d. They accumulate in crevices.
c
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Which of the following is the most common type of hydrolysis damage in the cell?
A. deamination of thymidine B. breakage of the glycosidic linkage between the pyrimidines and the DNA backbone C. removal of cytosine from the DNA backbone to create an abasic site D. deamination of cytosine to uracil E. None of the damage types given is known to occur in cells.
Unless a derived character state is lost or replaced by newer characters over evolutionary time, ____ can serve as
markers for ____ lineages that underwent adaptive radiation.
a. apomorphies; polyphyletic b. apomorphies; paraphyletic c. synapomorphies; monophyletic d. synapomorphies; polyphyletic e. synapomorphies; paraphyletic
Small areas that are home to a large number of threatened species and an exceptional concentration of species found nowhere else on Earth are called
A) biomes. B) movement corridors. C) biodiversity hot spots. D) local populations.
Membrane proteins, like membrane lipids, can move laterally by exchanging positions with other membrane components. Which type of membrane proteins is expected to be the least mobile, based on their function?
(a) channels (b) anchors (c) receptors (d) enzymes