The rise of methicillin-resistant Staphylococcus aureus (MRSA) can be considered to be an example of artificial selection because
A. humans purposefully raise MRSA in large fermenters in an attempt to make the bacteria ever-more resistant.
B. humans are becoming resistant to bacteria by taking methicillin.
C. humans synthesize methicillin and create environments in which bacteria frequently come into contact with methicillin.
D. S. aureus is cultivated by humans to replenish the soil with nutrients.
C. humans synthesize methicillin and create environments in which bacteria frequently come into contact with methicillin.
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When Thomas Hunt Morgan crossed his red-eyed F1 generation flies to each other, the F2 generation included both red- and white-eyed flies. Remarkably, all the white-eyed flies were male. What was the explanation for this result?
A) The gene involved is on the Y chromosome. B) The gene involved is on the X chromosome. C) The gene involved is on an autosome, but only in males. D) Other male-specific factors influence eye color in flies. E) Other female-specific factors influence eye color in flies.
The digestive system of an earthworm is more advanced than that of a flatworm
Indicate whether the statement is true or false.
You observe an individual of your favorite study organism expressing the dominant phenotype for a certain trait. How would you go about determining if the individual was homozygous dominant or heterozygous for that trait?
What will be an ideal response?
The figure below shows five water molecules. The hydrogen bonds shown in this figure are each between
A) two hydrogen atoms.
B) an oxygen and a hydrogen atom of the same water molecule.
C) an oxygen and a hydrogen atom of different water molecules.
D) two atoms with the same charge.