Question

question 10 of 10
which sentence describes a bone cell and a nerve cell in a persons body?
a. they have the same genes, and all of those genes are expressed.
b. they have identical dna, but each cell expresses a different set of genes.
c. their genes change as their structures change during cell differentiation.
d. each cell contains only the genes that are needed for its unique function.

Explanation:

All cells in an organism (like bone and nerve cells) have the same DNA (same genes). But during development, cells differentiate. This is because different genes are expressed (turned on or off) in different cell types. For example, nerve - specific genes are expressed in nerve cells and bone - specific genes are expressed in bone cells. Option A is wrong because not all genes are expressed in every cell. Option C is incorrect as genes don't change during cell differentiation (DNA sequence remains the same). Option D is false because cells have a full set of genes (from the genome), not just the ones for their function.

Answer:

B. They have identical DNA, but each cell expresses a different set of genes.