What are the big 6 macronutrients?

Prepare for the Microbial Metabolism Test. Utilize flashcards and multiple choice questions with helpful hints and detailed explanations. Ace your test with ease!

In metabolism, the elements required in the largest amounts to build biomolecules and support cellular processes are grouped as macronutrients. The big six are carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur. These elements form the backbone and functional components of the major biomolecules: carbon provides the core framework of organic molecules; hydrogen and oxygen are abundant in water and in nearly all organic compounds; nitrogen is essential for amino acids and nucleotides; phosphorus is key in nucleic acids, ATP, and phospholipids; sulfur appears in certain amino acids and cofactors. Because they are needed in large amounts, they make up most of the cell’s dry weight and drive the bulk of metabolic chemistry.

Helium is inert and does not participate in metabolism, so it’s not a nutrient for cells. Sodium and zinc, while important in biology, are required in much smaller amounts—sodium often for osmoregulation and membrane potential, zinc as a trace element cofactor—so they aren’t classified with the big six.