Which of the following statements concerning calmodulin is FALSE?
a. It activates protein kinases.
b. It activates phosphatases.
c. It is a protein.
d. It is found in all eukaryotic cells studied.
e. It binds a maximum of three calcium ions.
E
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If current changes in ocean temperature and pH caused a mass extinction of today's reefbuilding organisms,
A. we would see an unprecedented mass extinction, unlike anything the earth has experienced in the past. B. we would see one more in a series of mass extinctions that have wiped out reefs at least 3 times since the first reefs appeared over 500 million years ago. C. we would see one more in a series of mass extinctions that have wiped out reefs at regular intervals – roughly every 10 million years since the first reefs were formed over 500 million years ago. D. we would see the second great mass extinction of reefs; the only previous such extinction took place at the end of the Permian. E. none of these
Cell lineage diagrams are most easily prepared in which model organisms?
A. Drosophila melanogaster B. C. elegans C. Xenopus laevis D. Arabidopsis thaliana
A carbohydrate consists of
a. amino acid units. b. one or more sugar units. c. lipid droplets. d. glycerol.
The fruits of which of the following plants are
dispersed by wind? a. maple b. thistle c. dandelion d. cattail e. all of these