In early evolutionary history, primitive fishes
had lungs that eventually evolved into the
lungs of terrestrial organisms and the gas
bladders of modern fishes who use gills, not
lungs, for oxygen/ carbon dioxide gas
exchange. This is an example of
a. adaptive radiation.
b. exaptation.
c. sympatric speciation.
d. allopatric speciation.
e. temporal isolation
B
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In his experiments, Anfinsen treated a protein with a chemical that broke disulfide bonds and then removed the
chemical to see how this would affect the function of the molecule. What did he conclude from these experiments?
a. The information for determining the three-dimensional shape of ribonuclease lies in its amino acid sequence. b. The disulfide bonds are essential for quaternary, but not tertiary, protein structure. c. Protein conformation is maintained when disulfide bonds are disrupted. d. Altering the three-dimensional shape of the protein is irreversible. e. Disulfide bonds are unnecessary for proper protein function.
Endospores of certain bacterial species can enter tissues in the human body, germinate, and cause an infectious disease.
Answer the following statement true (T) or false (F)
Which trend best describes the levels of atmospheric CO2 since the start of the Industrial Revolution?
a. gradual decrease b. period fluctuations c. steady increase d. no apparent change
Bacterial ribosomes are composed of several polypeptides and
A) three RNA molecules in two subunits. B) three RNA molecules in three subunits. C) two RNA molecules in two subunits. D) two RNA molecules in a single complex. E) one large RNA molecule in a single complex.