Which highly reactive gas was probably absent from the Earth's primitive atmosphere?
A) methane
B) carbon dioxide
C) oxygen
D) water vapor
Answer: C
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The organisms that most specifically utilize light energy to make organic molecules from inorganic molecules are
A. photohemitrophs. B. heterotrophs. C. photoisotrophs. D. photoautotrophs. E. photoheterotrophs.
The part of an antigen binding site on an antibody that binds antigen is the
A) idioblast. B) idiotype. C) epitope. D) intron.
__________ selection favors intermediate forms of a trait where __________ selection favors extreme forms. Fill in the blank(s) with the appropriate word(s)
Which part of the cell theory is supported by what is shown in this illustration?
A) All organisms are composed of one or more cells. B) All cells arise from existing cells. C) Any cell in an organism can turn into a different type of cell. D) All cells have a similar structure.