Which nit rogen ous b ase is NO T foun d in DN A? Uracil Cytosine Thymine Guanine

## Step 1<br />The question asks us to identify which nitrogenous base is not found in DNA. The options given are Uracil, Cytosine, Thymine, and Guanine.<br /><br />## Step 2<br />We know that DNA (Deoxyribonucleic Acid) is composed of four nitrogenous bases: Adenine, Thymine, Cytosine, and Guanine.<br /><br />## Step 3<br />Uracil is a nitrogenous base, but it is not found in DNA. Instead, it is found in RNA (Ribonucleic Acid), where it pairs with Adenine.