Scientists use Carbon ___ to date very old fossils.
a. 11
b. 12
c. 13
d. 14
Answer: d. 14
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In the Northern Hemisphere, seasonal variation in temperatures is caused mainly by ____
a. the Earth's elliptical orbit taking it closer to and farther away from the sun b. the Earth's tilt on its axis of 23.5
During translation, chain elongation continues until:
a) a stop codon is encountered. b) all the tRNAs are converted to mRNAs. c) all the tRNAs are enzymatically broken down. d) the ribosome falls off the end of the mRNA. e) all the amino acids in the cell are used up.
In humans, equine encephalitis can present as a spectrum from fever and headache to ________and encephalitis.
Fill in the blank(s) with the appropriate word(s).
In the presence of water, nonpolar associations form between molecules or regions of molecules that are ____
a. partially charged b. hydrophobic and hydrophilic c. hydrophobic
d. fully charged e. hydrophilic