46) all cell cycle checkpoints are similar in which way?; a) they respond to the same cyclins.; b) they utilize the same cdks.;
c) they give the go-ahead signal to progress to the next checkpoint.; d) they each have only one cyclin/cdk complex.; e) they activate or inactivate other proteins.
Pangaea or Pangea ( /pænˈdʒiːə/) was a supercontinent that existed during the late Paleozoic and early Mesozoic eras. It assembled from earlier continental units approximately 335 million years ago, and began to break apart about 175 million years ago.
