What are the bonds that hold two amino acids together called?

Peptide bond.

Explanation:

The peptide bonds are polar, planner and partially double bonded in nature. The peptide bond is formed between the carboxylic group of one amino acid and the amino group of other amino acids. This is a condensation reaction, where the OH of carboxylic group pairs with the hydrogen of other amino group forming a water molecule. The water molecule is removed and the carbon atom pairs with nitrogen atom forming the peptide bond. Thus many peptide bonds are formed between more than two amino acids called polypeptides.

what's the question?

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.