Root hairs are most important to a plant because they _____

A) anchor a plant in the soil
B) store starches
C) increase the surface area for absorption
D) provide a habitat for nitrogen-fixing bacteria
E) contain xylem tissue


Answer: C

Biology & Microbiology

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Capillary waves are small

Indicate whether the statement is true or false

Biology & Microbiology

For statements 117–121 select the best choice of the four

evolutionary processes listed below. a. mutation b. gene flow c. genetic drift d. natural selection M 117. This is most likely to lead to the loss of genetic variation in a small population. E 118. This process produces new genetic variation within a species. M 119. This process can rapidly offset the effects of genetic isolation when two populations come into secondary contact. M 120. The reduced contribution of one phenotype in comparison to another to the next generation is an example of this. M 121. The occurrence of mimicry is best explained as the ultimate result of this process.

Biology & Microbiology

The sense of euphoria from low doses of barbiturates is chiefly due to __________.

A. an inhibition of the respiratory centers in the medulla B. a disinhibition of the cerebral cortex C. an inhibition of the reticular formation D. an excitation of the limbic system

Biology & Microbiology

Which of these people is most likely to have kidney trauma in an accident?

A) an obese older individual B) an elderly person with almost no body fat C) a person of average weight D) an obese younger person

Biology & Microbiology