Putting It Together: Important Biological Macromolecules


In this competency you learned about these topics:

  • Carbohydrates that provide energy for cells and serve other important roles such as physical support and storage.
  • Lipids or fats that make up important components of cell membranes and structural components
  • Proteins, the molecules that really “do” things in cells
  • Nucleic acids that serve primarily to convey genetic information in organisms


Now that you’ve finished reading this content, let’s return to our earlier questions about healthy diets. It is, in fact, impossible to have a no carb or no fat diet. These molecules are in all cells and cells makes up what we eat. More importantly though, each of these biological macromolecules has a very important role to play. Even the much maligned cholesterol is a requirement for a healthy body and lifestyle. If you cut too much fat from your diet, for example, it is possible that your fat stores dip low enough that your hair will fall out! Without sufficient cholesterol, your body doesn’t make enough sex hormones (estrogen or testosterone depending on if you’re male or female). The trick is to make healthy choices overall without too much of any biological macromolecules. There is certainly too much of a good thing.