RNA molecule makes up what percent of our cells?

Answer 1

It depends on how, exactly, you wish to measure it.

By mass, RNA molecules make up 1% of the mass of our cells. If you weigh 100 pounds, one pound of that is all the RNA in your body.

By molecule count, RNA molecules make up 0.00003% of our cells. 98% of the molecules in our body are water molecules, and relatively few RNA molecules get a lot of work done (DNA works even harder - there's 10,000 RNA molecules for every DNA molecule!).

What this means is that although there are very few RNA molecules, they are comparatively very large. Water is only made up of three atoms, but RNA is regularly made up of thousands.

Hope that helps!