You are looking at a single-stranded polymer that contains a pentose, a phosphate group, and the nitrogenous base uracil. what kind of molecule are you looking at?

The molecule is Ribonucleic acid (RNA)

Ribonucleic acid (RNA) is a biological molecule found in virtually all living things, and also in some viruses. RNA is very chemically close to DNA and is usually synthesized in cells from a DNA template of which it is a copy.RNA is a nucleic acid, that is to say, a molecule consisting of a sequence of nucleotides (polymer).
Each nucleotide of the RNA consists of a pentose, which is ribose, whose carbon atoms are numbered from 1 'to 5', a nitrogen base, or nucleic base, and a phosphate group.