In Charles Lyell's Principles of Geology, what idea had a significant impact on Charles Darwin's thinking?
A) Organisms change form over generations.
B) Populations produce more individuals than can survive.
C) Geological forces that are still operating act to change the Earth's surface.
D) A series of catastrophes wiped out life in given areas.
Answer: C
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Which of the following would describe the action of a chemical compound considered to be a mutagen?
A. Most are reactive and add bulky side groups to DNA bases. B. Most are able to bypass DNA repair mechanisms. C. Most are reactive and add bulky side groups to RNA bases. D. Most interfere with DNA replication. E. Most interfere with DNA transcription.
Answer the question using the accompanying figure. Which number identifies a structure that is composed of
polysaccharides?
a. 1 b. 3 c. 6 d. 7 e. 9
An infectious protein is a
A. virus. B. viroid. C. prion. D. virion. E. prophage.
An _______ is a general term for a substance that stimulates an immune response.
A. IgE B. antigen C. histamine D. interferon