What happens to pyruvate molecules formed in glycolysis in the absence of oxygen?
a) they will enter the krebs cycle.
b) they will undergo the process of fermentation.
c) they will move directly to the electron transport chain.

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.