Question

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which element is found in both dna and protein? options: sulfur, chlorine, sodium, nitrogen (context: introduction to life, course info)

Explanation:

To determine the element in both DNA and protein, we analyze each option:

• Sulfur: Present in some proteins (like in cysteine/methionine) but not in DNA.
• Chlorine: Not a key element in DNA or typical proteins.
• Sodium: Involved in ion balance, not in DNA/protein structure.
• Nitrogen: DNA has nitrogen in its nitrogenous bases (adenine, guanine, cytosine, thymine). Proteins have nitrogen in their amino acid (amine group, \(-NH_2\)). So nitrogen is in both.

Answer:

nitrogen