A cell has been subjected to X-ray irradiation, causing a significant number of mutations in the genome. Which of the following would you NOT expect to occur as a result?

(A) Activation of the protein kinase ATR
(B) Activation of the protein kinase Chk1
(C) Inactivation of the protein phosphatase Cdc25
(D) Binding of p53 to Mdm2
(E) Stabilization of p53

(D) Binding of p53 to Mdm2

Explanation:

Radiation can be very dangerous, as it has the ability to promote mutations in cells that can trigger physical anomalies that will bring great discomfort to the body. X-ray irradiation is not an exception and is capable of causing a significant number of mutations in the genome.

In relation to the question above, radiation X does not promote the binding of p53 to Mdm2, on the contrary, radiation causes the dissociation of these two systems. In addition, it causes the protein kinase ATR and Chk kinase to be deactivated, the protein phosphatase inactivation Cdc25 and p53 to stabilize.

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.