All cells in a multicelled organism have the same DNA. What does this mean?
A) Every cell produces the same range of proteins.
B) Each cell ultimately produces the same range of proteins but in a different order as the cell ages.
C) RNA polymerase affected by activator or inhibitor sequences is one way in which genes in most cells can be selectively turned on or off.
D) External chemical inputs must be used to determine which genes are expressed in which cells.

Question

Quizplus · Accepted Answer

C is correct because in multicellular organisms, although all cells contain the same DNA, the expression of genes can be selectively regulated through mechanisms such as the action of RNA polymerase being affected by activator or inhibitor sequences. This allows different cells to express different sets of genes, enabling the differentiation of cell types and functions within the organism.

All Cells in a Multicelled Organism Have the Same DNA