A friend asks you for a definition of endemic because she is writing a history paper and this word keeps occurring in the literature in reference to bison on the Great Plains of the United States. Your response is that the word endemic means
A. a species that has coevolved with humans on Earth.
B. a species that lives in only one area of Earth.
C. a species that has gone extinct since humans have evolved on Earth.
D. a species that exists in many habitats on Earth.
Answer: B
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Indicate whether the statement is true or false
M. xanthus has an alternate motility type, known as ________ motility, because it is exhibited by single cells that leave the group, perhaps scouting for prey and requires a multiprotein motility "machine."
Fill in the blank(s) with the appropriate word(s).
If all functional groups are removed from an organic molecule, leaving only a hydrocarbon chain, the molecule becomes a:
A. Protein B. Lipid C. Nucleic acid D. Carbohydrate
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A. It allows for more efficient movement across open ground. B. It made upright walking more energy efficient. C. It keeps the body cooler. D. It allows for better stereoscopic vision. E. It is easier to scan the horizon for predators.