Viruses are composed of only ____
a. proteins
b. carbohydrates and proteins
c. proteins and nucleic acids
d. nucleic acids
e. carbohydrates, proteins, lipids, and nucleic acids
ANSWER: c
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It has been difficult to generate drugs to treat AIDS for which reason?
A. HIV does not cause AIDS. B. HIV does not use any enzymes that can be targeted by drugs. C. HIV mutates rapidly. D. The only way to kill a virus is with a vaccine, not with drugs. E. People with HIV infections die rapidly, before the drugs have a chance to cure them.
Which type of fat was found to contribute the most relative risk of developing heart disease?
A) saturated fat B) monounsaturated fat C) polyunsaturated fat D) trans fat
The ____ includes all of the water on Earth
a. abiotic environment b. biotic environment c. hydrosphere d. lithosphere e. atmosphere
How is the net primary productivity of an ecosystem calculated?
What will be an ideal response?