Which statement best explains why skin cells will never become nerve cells?

Question

a. each type of cell gets a different message from the central DNA which is sorted in DNA cells

b. both types of cells have the same DNA but each cell uses only one part of the DNA message

c. each type of cell has only the part of the DNA necessary for making that type of cell

d. each cell type is determined by messages from the brain which direct development

Answer 1

The correct choice is b. both types of cells have the same DNA but each cell uses only one part of the DNA message

This is so because ALL your cells come from the one original cell (zygote) and have therefore the same DNA code. Yet as the number of cells grows and the organism's body starts to take shape the cells will 'differentiate' or express/use different parts of the DNA code that is needed to complete their function i.e.be a nerve cell and ONCE a cell does this it is called 'specialization' which locks the cells into that role and changes its shape and chemical make-up accordingly.

Answer 2

a) WRONG: There is no such thing as DNA Cells. Each cell contains DNA in the nucleus.

b) CORRECT: Each cell contains the entire genome, but only a certain part is actively expressed to provide the attributes of a particular cell type.

c) WRONG: Every cell carries the entire genome.

d) WRONG: The brain does not direct development and differentiation of cells.