Yes
chemical bonds 3 types: Ionic Covalent Metallic
DNA
The energy in a source molecule is stored in the chemical bonds that hold its atoms together. When these bonds are broken, energy is released that can be used to fuel various cellular processes through biochemical reactions. This energy can be transferred and converted into different forms to power the functions of living organisms.
dna
, Amino acids are linked together through the process of translation, the making of a protein. When translation occurs, mRNA recruits tRNA that has complementary amino acids to the ribosome. The tRNA goes through the three sites on the ribosome and the amino acids will be joined together by a peptide bond at the peptidyl-tRNA molecure site. As the tRNA reaches the terminal site it dispatches from the amino acid and takes off to find new corresponding amino acids, while the previous amino acid is joined to other amino acids by the peptide bonds, forming a protein altogether. Hope this helps.
Oxygen allow our bodies to breathe and live. The amount of oxygen needed will depend on the activity. For instance, when exercising, you would need more oxygen than if you are sitting at rest.