Over a span of two decades, scientists measured changes in the beak size of a population of Galápagos ground finches. This ________
A) provided evidence of natural selection in action
B) is an example of artificial selection
C) is an example of overproduction
D) led Darwin to his theory of evolution through natural selection
A
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___________________ are organisms that derive energy from sunlight
A. Phototrophs B. Autotrophs C. Heterotrophs D. Chemotrophs E. Lithotrophs
An amino acid is to a protein as a ________ is to a nucleic acid.
A. glucose B. glycerol C. nucleotide D. fatty acid E. cellulose
A drug researcher has developed a macromolecule that can bind to scrapie and thus change the prions conformation. What effect might this have on the actions of scrapie?
A. The shape change could prevent the scrapie protein from converting normal proteins to scrapie proteins B. The shape change could induce scrapie protease activity C. The shape change could stop the transcription of scrapie RNA D. The shape change could stop the replication of scrapie DNA E. The shape change could block the translation of scrapie RNA
Visible light comprises wavelengths that vary
between ____ nanometers.
a. 380 and 750 b. 350 and 750 c. 390 and 780 d. 340 and 740 e. 320 and 740