The light switch

The DNA

protein

There is no switch

Needs to be made in abundance and all of the time in the cell.

Needs to be made more sparingly in the cell (lower amount) but still all of the time.

Needs to be made in abundance, but only at specific times. (And quickly!) 

Does not need to be made

Needs to be made in abundance and all of the time in the cell.

Needs to be made more sparingly in the cell (lower amount) but still all of the time.

Needs to be made in abundance, but only at specific times. (And quickly!) 

Doesn't need to be made.

Needs to be made in abundance and all of the time in the cell.

Needs to be made more sparingly in the cell (lower amount) but still all of the time.

Needs to be made in abundance, but only at specific times. (And quickly!) 

Doesn't need to be made.

Needs to be made in abundance and all of the time in the cell.

Needs to be made more sparingly in the cell (lower amount) but still all of the time.

Needs to be made in abundance, but only at specific times. (And quickly!) 

Doesn't need to be made

Needs to be made in abundance and all of the time in the cell.

Needs to be made more sparingly in the cell (lower amount) but still all of the time.

Needs to be made in abundance, but only at specific times. (And quickly!) 

Doesn't need to be made