Question

which elements are present in each type of molecule? start by filling in the table, writing “always,” “sometimes,” or “never” in each box. carbon hydrogen nitrogen oxygen phosphorus sulfur proteins carbohydrates nucleic acids lipids

Explanation:

Proteins always contain carbon, hydrogen, oxygen, and nitrogen. Sometimes they contain sulfur.
Carbohydrates always contain carbon, hydrogen, and oxygen.
Nucleic acids always contain carbon, hydrogen, oxygen, nitrogen, and phosphorus.
Lipids always contain carbon, hydrogen, and oxygen. Sometimes they contain phosphorus.

Answer:

Molecule Type	Carbon	Hydrogen	Nitrogen	Oxygen	Phosphorus	Sulfur
Carbohydrates	Always	Always	Never	Always	Never	Never
Nucleic Acids	Always	Always	Always	Always	Always	Never
Lipids	Always	Always	Never	Always	Sometimes	Never