What part of the respiratory system does cigarette smoke most adversely affect?

A) alveoli
B) trachea
C) bronchi
D) diaphragm


Answer: A

Biology & Microbiology

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Which country has the largest ecological footprint?

a) Zambia b) China c) United States d) England

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The scientific method involves each of the following EXCEPT 

A. systematic search for information. B. observation and experimentation. C. forming and testing possible solutions. D. formulation of laws and principles that control the observed facts.

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During the process of electrophoresis, the ________ functions like a molecular sieve, separating the samples according to their size

A) sample mixture B) positively charged electrode C) negatively charged electrode D) agarose gel

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Crop rotation occurs where different types of plants are grown on the land each season. If you had no access to chemical fertilizers, which of the following would be best to include in your rotation cycle?

A) beans B) cotton C) corn D) tobacco

Biology & Microbiology