The rare enol form of thymine pairs with guanine. If a thymidine within the DNA helix shifts to the enol form during replication, base pairing would change from a T-A base pair to a

b. lithosphere, asthenosphere, mesosphere   is the answer most likely

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.

if the hares very faster than they are now, and thus the lynx's hunting success rate drops because it will be harder to catch them, the rate that will change will be the pray-rate. the pray-rate will change because more hares will be able to survive, thus more individuals for reproduction, so the end result will be increasing population of hares.

the predator-rate will remain pretty much the same because there will be more than enough pray, but the hunting success rate is stagnant.

it marks things for degradation via the proteasome. it alters there celluar location.