Question

question 1 1 pts ________ are changes to the nucleotides in a segment of dna that codes for a protein. proto - oncogenes tumor suppressor genes mutations regulations question 2 1 pts which of the following is not a feature of cancer cells? lack of contact inhibition immortality lack of differentiation these are all characteristics of cancer cells.

Explanation:

For Question 1, mutations are changes in the nucleotide - sequence of DNA that codes for a protein. Proto - oncogenes are normal genes that can become oncogenes when mutated, tumor suppressor genes regulate cell division and prevent cancer, and regulations refer to control mechanisms.
For Question 2, cancer cells lack contact inhibition (they keep growing when in contact with other cells), they can be immortal (divide indefinitely), and they lack differentiation (do not develop into specialized cell types). So all the options are features of cancer cells.

Answer:

Question 1: C. mutations
Question 2: D. these are all characteristics of cancer cells.