All your cells contain proto-oncogenes, which can change into cancer-causing genes. why do cells possess such potential time bombs?
a. cells produce proto-oncogenes as a by-product of mitosis.
b. proto-oncogenes are necessary for the normal control of cell growth and division.
c. proto-oncogenes protect cells from infection by cancer-causing viruses.
d. proto-oncogenes are unavoidable environmental carcinogens.
e. proto-oncogenes are genetic junk that has not yet been eliminated by natural selection.

B

Explanation:

Proto-oncogenes contain proteins that stimulate cell division, inhibit cell differentiation,and prevent cells from dying. These processes are important for normal development and for the maintenance of tissues and organs.

An alternation of these proto-oncogenes leads to the formation of oncogenes which are particularly responsible for abnormal cell division resulting in cancer cells

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2