Multiple choice

Phosphorus is a structural element in

  1. proteins

  2. cytochrome

  3. carbohydrates

  4. DNA

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Phosphorus is a key structural component of DNA and RNA. DNA (deoxyribonucleic acid) is a nucleic acid, and its backbone contains phosphate groups which contain phosphorus. Proteins contain nitrogen but no phosphorus in their basic structure. Cytochrome is a protein, and carbohydrates contain carbon, hydrogen, and oxygen only.

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