What is the evidence that human activity is causing increased atmospheric CO2 levels?
A. The isotopic composition of atmospheric
CO2 can be measured and shows that CO2
being added to the air now comes from
combustion of fossil fuels.
B. There is a correlation between the
increase of overall CO2 levels and human
activity since the Industrial Revolution.
C. There is no direct evidence; CO2 levels
fluctuate naturally and it may just be
coincidence that higher CO2 levels
correspond to this period of human activity.
D. There is no direct evidence; it is
impossible to know what CO2 levels were like
in the past, so there is no standard for
comparison.
E. Since forests are being cut down by
humans, CO2 levels must be rising because
there are fewer plants that remove CO2
through photosynthesis.
A
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You transform bacteria with a plasmid carrying the ampicillin-resistance gene ampR. How would you determine which bacteria took up the plasmid?
A. Bacteria containing the plasmid would be able to grow in the absence of ampicillin. B. Bacteria containing the plasmid would be able to produce ampicillin. C. Bacteria containing the plasmid would turn blue. D. Bacteria containing the plasmid would be able to grow in the presence of ampicillin. E. Ampicillin-resistance is necessary for the plasmid DNA to get into the bacteria.
Bacterial endospores are produced by ________.
A. Mycoplasma B. Staphylococcus C. Entamoeba D. Bacillus
The human axial skeleton includes all of the following except the
1.skull. 2.ribs. 3.pectoral girdle. 4.sternum. 5.vertebral column.
A population of 1,000 birds exists on a small Pacific island. Some of the birds are yellow, a trait determined by a recessive allele. The others are green, a characteristic determined by a dominant allele. A hurricane on the island kills most of the birds from this population. Only ten remain, and those birds all have yellow feathers. Which of the following statements is true?
A) Assuming that no new birds come to the island and no mutations occur, future generations of this population will contain both green and yellow birds. B) The hurricane has caused a population bottleneck and a loss of genetic diversity. C) This situation illustrates the principle of adaptive radiation. D) This situation illustrates the effect of a mutation event. E) The ten remaining birds will mate only with each other, and this will contribute to gene flow in the population.