An oncogene is: select one:

a viral gene with no relation to the host cells genes.

b. a mutated form of a proto-oncogene.

c. a bacterial gene that causes cancer in the host.

d. always seen in human cancer cells. e. a gene that turns off cellular reproduction.

I think it is A. I'm only guessing because I have never heard of an Oncogene before.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called