Patients with mitochondrial disorders share many symptoms, such as muscle weakness, because mitochondria ________
a. organize the construction of muscle protein
b. generate the ATP that is necessary for muscle contraction
c. facilitate the transport of glucose across the muscle cell membrane
d. store and then release the oxygen used during muscle contraction
b
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Which one of these mollusk groups can be classified as suspension feeders?
A) bivalves B) gastropods C) chitons D) cephalopods
Which activity will release mercury into the atmosphere? a. All of these choices will release mercury into the atmosphere
b. Volcanic eruptions c. Burning of fossil fuels d. Flying in an airplane e. Driving a car
Over the past century, sagebrush has dramatically expanded its range over the Colorado plateau's grasslands. This development has been attributed to the overgrazing of the area's grasses by cattle and sheep. This example indicates that
A) sagebrush could not exist anywhere in the absence of cattle and sheep. B) grazing has no effect on the distribution of plants. C) the relationship between sagebrush and grasses is mutualistic. D) the range of sagebrush is normally limited by competition with grasses. E) sagebrush is the dominant competitor over grasses.
The two critical elements required to sign the bias of an omitted variable include the sign of the:
A. effect of the omitted variable on the outcome and the sign of the correlation between the omitted variable and the treatment. B. correlation between the omitted variable and the outcome and the sign of the correlation between the treatment variable and the outcome. C. effect of the omitted variable on the outcome and the sign of the correlation between the omitted variable and the outcome. D. effect of the omitted variable on the outcome and the sign of the effect of the treatment variable on the outcome.