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
You might also like to view...
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.
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.
The following nutrient most associated with
eutrophication is: a. iron. b. hydrogen. c. oxygen. d. carbon. e. phosphate.
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