What kind of molecule is thought to have been the first genetic material?

a) DNA
b) protein
c) microsphere
d) carbohydrate
e) RNA


Ans: e) RNA

Biology & Microbiology

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Which statement does NOT distinguish Darwin’s theory of natural selection from earlier descriptions of biological

diversity and adaptive traits?

a. Biological diversity has purely physical, rather than spiritual, origins. b. Evolutionary change occurs in groups of organisms, rather than in individuals. c. Spiritual explanations account for the origin but not the diversification of individuals. d. Some organisms function better than others in a particular environment. e. Evolution is a multistage process and natural selection eliminates unsuccessful variations.

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The following nutrient most associated with

eutrophication is: a. iron. b. hydrogen. c. oxygen. d. carbon. e. phosphate.

Biology & Microbiology

HIV is a human retrovirus that integrates into the host cell's genome and will eventually replicate, produce viral proteins, and ultimately escape from the host cell. Which of the following proteins is not encoded in the HIV genome?

(a) reverse transcriptase (b) envelope protein (c) RNA polymerase (d) capsid protein

Biology & Microbiology

A recent (2009) example of a U.S. tariff on foreign imports which caused retaliation from trading partners was the case of a U.S. tariff imposed on Chinese

a. tire imports. b. agricultural imports. c. airplane imports. d. clothing imports.

Biology & Microbiology