Questions: In addition to carbon, hydrogen, and oxygen, all amino acids contain this element: a) nitrogen (N) b) phosphorus (P) c) sulfur (S) d) sodium (Na)

Transcript text: In addition to carbon, hydrogen, and oxygen, all amino acids contain this element: $\qquad$ a) nitrogen ( $N$ ) b) phosphorus (P) c) sulfur (S) d) sodium $(\mathrm{Na})$

Solution

Solution Steps

Step 1: Identify the Common Elements in Amino Acids

Amino acids are organic compounds that serve as the building blocks of proteins.
They are composed of carbon (C), hydrogen (H), oxygen (O), and an additional element.

Step 2: Determine the Additional Element

The defining feature of amino acids is the presence of an amino group ($-\text{NH}_2$).
This amino group contains nitrogen ($N$).

Step 3: Select the Correct Option

Based on the presence of the amino group, the additional element in all amino acids is nitrogen ($N$).
Therefore, the correct answer is option a) nitrogen ($N$).

Final Answer

The correct answer is A.

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