Organisms that require organic sources of carbon and energy are called (autotrophs /chemoautotrophs/chemoheterotrophs /).
Fill in the blank(s) with the appropriate word(s).
chemoheterotrophs
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A fragment of DNA or RNA labeled with a tracer that can hybridize with a nucleotide sequence of interest is referred
to as a ____.
a. clone b. plasmid c. vector d. marker e. probe
Viruses can infect any living thing.
Indicate whether the statement is true or false.
RNA was likely replaced by DNA as the genetic molecule in most organisms because:
a. RNA is less stable than DNA. b. RNA has a higher chemical stability. c. RNA errors are more easily corrected than DNA errors. d. A and C. e. All of the above.
What is involved in the process of denitrification?
A. conversion of ammonium to nitrate B. conversion of nitrite to nitrate C. conversion of nitrate to nitrogen gas D. conversion of nitrogen gas to ammonium E. conversion of nitrogen gas to nitrate