A single gene mutation would most likely occur if 1.
messenger-RNA molecules temporarily bond to DNA molecules
2.
the cytoplasm lacks the amino acids necessary to synthesize a certain polypeptide
3
a base sequence in a DNA molecule is changed
4
transfer-RNA molecules do not line up properly on a messenger-RNA molecule

How is anaerobic respiration affected by changes in temperature? (5 points)based on the conditions of early earth, what conclusion can you draw about the amount of anaerobic respiration that was occurring at earth’s beginning? explain your answer.(5 points)if there was a sudden drop in temperature after the evolution of the first living cells, predict how that might have affected the changes in the atmosphere and the evolution of cyanobacteria and other autotrophs. explain your answer. (5 points)