What region of a Winogradsky column contains the greatest concentration of H2S?

a. top
b. middle
c. bottom
d. both top and middle


Answer: C

Biology & Microbiology

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Oxygen concentration generally plays an important role in regulating respiration:

a. all the time. b. never. c. only when the carbon dioxide concentration falls markedly. d. only when the oxygen concentration falls markedly. e. only when the pH falls markedly.

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In all symbiotic relationships, both species involved benefit from the association

Indicate whether the statement is true or false

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Which most completely describes the circumstances under which yarrow will alter its phenotype?

A. Temperature, soil conditions, and water conditions B. Soil conditions only C. Being produced by sexual versus asexual reproduction D. Water conditions only E. Asexual reproduction, soil conditions, and water conditions

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All of the following describe characteristics of sclerenchyma cells, except which?

A. Their secondary walls may be impregnated with lignin. B. Their function is primarily to transport oxygen and carbon dioxide throughout the leaf. C. They have thick, tough secondary walls. D. They lack living protoplasts when mature. E. They form fibers and sclereids.

Biology & Microbiology