Geological evidence reveals that the atmosphere on Earth originally lacked oxygen. What process initiated the build-up of oxygen in the atmosphere?
a. Fixing carbon dioxide from the atmosphere resulted in oxygen being emitted.
b. The formation of ATP and harvesting of the energy in chemical bonds resulted in oxygen being released.
c. Water, used as a hydrogen source, resulted in oxygen as a waste product.
d. The first terrestrial plants utilized carbon dioxide and gave off oxygen, just like plants today.
c. Water, used as a hydrogen source, resulted in oxygen as a waste product.
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The organisms that obtain energy by oxidation of hydrogen sulfide and use carbon dioxide as a carbon source are called
A. heterotrophs. B. chemoheterotrophs. C. autotrophs. D. chemolithoautotrophs.
Some mutations can be corrected using enzymes found in the cell.
a. true b. false
Members of which prokaryotic domain are most closely related to eukaryotes evolutionarily?
A. Animals B. Protists C. Fungi D. Bacteria E. Archaea
Candida albicans can establish opportunistic infections of the
A. mouth. B. skin. C. eye. D. liver. E. eyes, liver, mouth, skin, and other organs.