What step occurred first in the evolution of life?
A) formation of DNA
B) formation of protein-RNA systems
C) formation of membrane-bound proto-cells
D) spontaneous formation of organic compounds under abiotic conditions
E) formation of ATP
Correct Answer:
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Q10: The by-product of the metabolism of cyanobacteria
Q10: The accumulation of free oxygen in the
Q16: The first eukaryotic fossils are dated to
Q19: The first cells were
A) autotrophic.
B) parasitic.
C) anaerobic.
D)
Q23: By 3.2 billion years ago, chemosynthetic cells
Q24: Hydrothermal vents are associated with the newest
Q25: The endosymbiotic theory is supported by the
Q26: According to the endosymbiotic theory, eukaryotic cells
Q32: Which of the following is the probable
Q32: Mitochondria resemble bacteria in
A)size.
B)structure.
C)that they contain DNA.
D)that
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