Question

Body cells include nerve cells and muscle cells. Each makes a number of different proteins. For example, nerve cells make cholinesterase and muscle cells make myosin. Which statement best compares the DNA normally found in these two types of cells in an individual?

(1) The two cells have identical DNA sequences and use the same section of the DNA to make these two proteins.
(2) The two cells have identical DNA sequences, but use different sections of the DNA to make these two proteins.
(3) The two cells have different DNA sequences, but use the same section of the DNA to make these two proteins.(4) The two cells have different DNA sequences and use different sections of the DNA to make these two proteins.

Answer 1

The DNA normally found in nerve cells and muscle cells is identical in sequence, but different sections of the DNA are used to make different proteins.

Step-by-step explanation:

The correct statement that best compares the DNA normally found in nerve cells and muscle cells is (1) The two cells have identical DNA sequences and use the same section of the DNA to make these two proteins.

All cells in the body generally contain the same DNA sequences. The differences between cell types, such as nerve cells and muscle cells, arise from the specific genes that are expressed or turned on in each cell. In this case, both nerve cells and muscle cells have the same DNA sequences, but they use different sections of the DNA to make different proteins.