Explanation:

- Chromosomes are primarily composed of DNA and proteins.

- Proteins: ? These are crucial for the structure and function of chromosomes. Histone proteins help package DNA into a compact, structured form.

- Lipids: ? These are fats and are not a component of chromosomes. They are more related to cell membranes and energy storage.

- Vitamins: ? These are organic compounds vital for health but do not form part of the chromosome structure.

- Carbohydrates: ? While important for energy and structural roles in cells, they are not part of chromosomes.