Where do cells get the chemicals needed to synthesize other molecules?
it is transcribed by the messenger rna
they "borrow" it from the dna
from the food they take in
from h2o

from the food they take in

The chemicals needed to produce molecules comes from the food which an organism eat. A food is a rich source of fats, oils, proteins, carbohydrates and vitamins which are required by the cells to produce functional molecules necessary for building the body and maintaining it's proper functioning.

photocells convert light energy to electricity

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.