The Ogallala aquifer provides what percentage of groundwater used for irrigation in the United States?

a. 10 percent
b. 25 percent
c. 30 percent
d. 50 percent
e. 75 percent


ANSWER: c

Biology & Microbiology

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Plants produce a variety of defensive compounds that can seriously affect herbivores. Why aren't these compounds also detrimental to the plants themselves? Select all correct choices

A. They can be sequestered in vacuoles of plant cells. B. They can diffuse from leaves into the phloem of plants. C. They can travel through canals in the plant. D. They can diffuse quickly between plant cells before they have an effect.

Biology & Microbiology

These bacteria ferment sugars, produce lactate, and are used for some food production

a. Lactobacillus b. Bacillus c. spirochetes d. Agrobacterium e. cyanobacteria

Biology & Microbiology

List the steps of the citric acid cycle in order

What will be an ideal response?

Biology & Microbiology

In a survey of Dall mountain sheep in Denali National Park in Alaska, researchers found that wolves preyed primarily on the most vulnerable members of the population, the young and the old. What conclusion is best supported by this data?

A. Dall mountain sheep in Denali are an r-selected population. B. A program should be established to cull the wolf population. C. A program should be established to cull the sheep population. D. Wolf predation is not dramatically reducing the sheep population. E. The wolf population is at its carrying capacity, so it is no threat to the sheep population.

Biology & Microbiology