How do some cells become brain cells and others become skin cells when the DNA IN ALL the cells is exactly the same. In other words, if the instructions are exactly the same how does one cell become a brain cell and another a skin cell?

Which of the following is a good definition for the word adaptation? question 1 options: a trait that an organism survive and reproduce in its environment. a change in an organism's environment. the way in which animals obtain food. a temperature change that can cause the extinction of plants and animals.

Due tonight 10 points will mark brain

Suppose you are provided with an actively dividing culture of e. coli bacteria to which radioactive thymine has been added. what would happen if a cell replicates once in the presence of this radioactive base?