Answer:
[tex]\boxed {\boxed {\sf A. \ Uracil}}[/tex]
Explanation:
DNA (deoxyribonucleic acid) has two chains of nucleotides that form a double helix that resembles a twisty ladder. The nucleotides are:
- Adenine (A)
- Guanine (G)
- Cytosine (C)
- Thymine (T)
RNA (ribonucleic acid) is different. It only has one chain of nucleotides. The bases are also different:
- Adenine
- Guanine
- Cytosine
- Uracil (U)
We see that RNA has a different base! It contains uracil instead of thymine. The correct answer must be A. uracil
