Here's a breakdown of the components of nucleic acids, categorized by whether they are found exclusively in DNA, RNA, or both:

Exclusively in DNA:

* Thymine (T): A nitrogenous base that pairs with adenine (A) in DNA.

Exclusively in RNA:

* Uracil (U): A nitrogenous base that pairs with adenine (A) in RNA. It replaces thymine in RNA.

* Ribose sugar: The five-carbon sugar in RNA, containing a hydroxyl group at the 2' position.

Found in Both DNA and RNA:

* Adenine (A): A nitrogenous base that pairs with thymine (T) in DNA and uracil (U) in RNA.

* Guanine (G): A nitrogenous base that pairs with cytosine (C) in both DNA and RNA.

* Cytosine (C): A nitrogenous base that pairs with guanine (G) in both DNA and RNA.

* Phosphate group: The backbone of nucleic acids, linking the sugar molecules together.

* Deoxyribose sugar: The five-carbon sugar in DNA, lacking a hydroxyl group at the 2' position.

Key Differences:

* Sugar: DNA has deoxyribose sugar, while RNA has ribose sugar.

* Base: DNA has thymine, while RNA has uracil.

* Structure: DNA is typically double-stranded, forming a helix, while RNA is usually single-stranded.

Let me know if you have any other questions about nucleic acids!