What is an important difference between the biosynthesis of purine nucleotides and pyrimidine nucleotides?

a. the growing pyrimidine ring is bonded to ribose while the ribose is added later to the purine ring.
b. purine nucleotides require n10- in their biosynthetic pathways.
c. the growing purine ring is bonded to ribose while the ribose is added later to the pyrimidine ring.
d. proline is the precursor for purine biosynthesis while it is not for pyrimidine biosynthesis.

How do temperature and salinity affect deepwater currents? they create changes in wind direction, moving denser water in the same direction as the wind and causing the deepwater circulation patterns found in the ocean. as temperatures and salinity levels of water increase, the water rises to the surface where it creates currents as it moves to colder regions. they create density differences that cause dense deepwater currents to flow toward the equator where they displace less dense, warmer water above them. they equalize the forces on undersea currents caused by the coriolis effect as they replace more dense water with less dense water.