The energy used by cells comes from what? Molecules diffusing across the cell membrane.
The synthesis of water molecules.
Proteins produced in the ribosomes.
The breakdown of food in the presence or absence of oxygen.

2. what process do mrna and trna work together to complete? (3 points)

Which of these best describes what occurs during cytokinesis? a) the chromosomes are separated b) the cell begins to divide by replicating the chromosomes c) the cytoplasm is divided between the two new daughter cells d) the nucleus opens to allow the chromosomes to enter the cytoplasm

What is the ecological role of food chains and food webs