The phrase "acid molecules" refers to small particles that are part of substances called acids. These molecules are responsible for the sour taste and other properties that acids have. Full definition
These are fatty acid molecules found in cold water fish (and some cold - adapted mammals). (dogfoodinsider.com)
Their atoms are arranged in such a way that makes the entire amino acid molecule appear left - handed, or «L» for short. (sciencedaily.com)
The CRISPR system is made up of two components: a protein called Cas9 and a guide RNA, a string of nucleic acid molecules with a certain genetic code. (scientificamerican.com)