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Why is the accumulation of C3b on a target faster once one molecule of C3b is already there?

Why is so much more ATP regenerated from cellular respiration when compared with fermentation?

A number of separate, isolated caves contain populations of fish in underground streams. In each one, the cavefish are pale in color and are eyeless. When gene sequences were compared, it turned out that each population of cavefish was most closely related in sequence to the nearest population of sighted fish living in streams on the surface. What can you conclude?

A: The eyeless characteristic is homologous to the pale color characteristic.

B: Loss of eyes evolved independently in each cave.

C: Loss of eyes happened once and the fish spread to various caves.

D: The eyeless characteristics of the different cavefish are all homologous.

If you have 1.0 x 109 molecules in a tube and perform a 10-7 dilution, how many molecules will be in the new tube?

Experiments show that it takes 1656 kJ/mol to break all the bonds in methane (CH4) and 4006 kJ/mol to break all the bonds in propane (C3H8). Based on these data, calculate the average bond enthalpy of the C―C bond.