Which statement does NOT describe external regulatory proteins? 1 They respond to events occurring inside a cell.
2. Growth factors are one group of external regulatory proteins.
3. They can speed up or slow down the cell cycle.
4. Some can cause cells to slow down or stop their cell cycles.

1) They respond to events occurring inside a cell.

Explanation:

The rest DO describe external regulatory proteins except the first option.

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sex cells are usually half's then they find another half and make a fertilize egg