mRNA (messenger RNA) does not contain sugar in the way that carbohydrates do. However, it does contain ribose, a five-carbon sugar, which is an integral part of its structure.

Here's how it works:

* Nucleotides: mRNA, like all RNA molecules, is made up of nucleotides.

* Nucleotides are composed of three parts:

* A phosphate group

* A nitrogenous base (adenine, guanine, cytosine, or uracil)

* A sugar molecule

* Ribose is the sugar in RNA: It's a five-carbon sugar that differs from deoxyribose (the sugar in DNA) by having an extra hydroxyl group.

So, while mRNA doesn't contain "sugar" in the traditional sense, it does have ribose as a crucial component of its structure.