Biology fund nutrition

The food we eat - our diet - is made up of different biological molecules which gives us energy and contain chemicals we need to grow and repair ourselves and help our cells function in our body.

Carbohydrates and fats are made up of carbon, hydrogen and oxygen.

Proteins contain carbon, hydrogen, oxygen and nitrogen.

I think the correct answer from the choices listed above is option C. The lac operon is most active when glucose levels are low and lactose is present. A lac operon is an operon required for transport and metabolism of lactose. Hope this answers the question.