This mineral salt helps to trap light in photosynthesis 1)nitrate

2)phosphate

3)potassium

4) magnesium

Which of these is not a function of some membrane proteins ? a. allowing polar molecules to enter the cell b. recognizing other types of cells c. receiving messeges from other cells b. carrying messages to oher cells

What protects the lining of the stomach from acidic gastric juices?

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above