Which is NOT true about gene mutations?
a. All are transmitted to the next generation.
b. They are rare but their rates can be
predicted.
c. Those with beneficial effects will be
favored by natural selection.
d. Many reduce an individual's chance of
surviving and reproducing.
e. Those with neutral effects neither help nor
hurt the individual.
A
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Micro RNAs (miRNAs)
a. are short sequences only 22 or so bases long. b. are noncoding RNA sequences that bind to a protein complex. c. can regulate mRNA translation by cleaving the mRNA. d. can prevent translation of its target mRNA by blocking the ribosome. e. all of these
Fanny Hesse first suggested that agar be used to solidify microbiological media.
Answer the following statement true (T) or false (F)
With the advent of photosynthesis and the subsequent production of oxygen by photosynthetic organisms, most of the anaerobic organisms present on Earth became extinct because oxygen was actually toxic to these organisms
Indicate whether the statement is true or false
The essential amino acids are those produced by the body and thus do not need to be eaten.
a. true b. false