What is the difference between DNA and RNA?

The differences between DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) are as follows:

1. **Strand Structure**: DNA is typically double-stranded, forming a double helix, while RNA is usually single-stranded. (Your statement was reversed regarding this characteristic.)

2. **Nitrogenous Bases**: DNA contains thymine (T), whereas RNA contains uracil (U). This is a key difference in their nucleotide composition.

3. **Location**: In eukaryotic cells, DNA is primarily located in the nucleus, while RNA is synthesized in the nucleus and then travels to the cytoplasm for protein synthesis. However, RNA can also be found in the nucleus and other organelles.

4. **Building Blocks**: Both DNA and RNA are made of nucleotides, not amino acids. The main difference is in the type of sugar in their nucleotides: DNA contains deoxyribose, while RNA contains ribose.

In summary, the two types of nucleic acids differ in their structure (strand), base composition, location within the cell, and sugar type, but both are made of nucleotides. None of the statements you provided accurately describe the differences entirely.