Which of the following best explains why modern seedless vascular plants are confined largely to wet or humid environments?
a. They require soil.
b. They require reflected sunlight.
c. They require symbiotic bacteria in the water.
d. They require external water for reproduction.
Ans: d. They require external water for reproduction.
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A diagnosis of tuberculosis involves a/an ________.
A. tuberculin skin test B. sputum culture C. chest X ray D. acid-fast stain of sputum E. All of the choices are correct.
The dominant vegetation of the temperate rain forest includes which of the following?
a. Sitka spruce b. western red oak c. beech d. bamboo e. Southern pine
Tumor-suppressor genes _____
A) are frequently overexpressed in cancerous cells B) are cancer-causing genes introduced into cells by viruses C) encode proteins that help prevent uncontrolled cell growth D) often encode proteins that stimulate the cell cycle
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A) exergonic; endergonic B) endergonic; exergonic C) equilibrium; exergonic D) enzymatic; endergonic E) endergonic; enzymatic