I don’t know the author or what book/literary work this is, but could be how proteins are produced.
The untrue statement is that they high melting points.
The covalent compounds are the compounds exhibiting strong intra-molecular bonds. This is due to the tightness of the atoms within the covalent molecules. The force of attraction between the individual molecules in a covalent compound seems to be weak. The covalent compounds exhibit weak intermolecular forces that hold the atoms together due to this they have a low melting point.
nucleus: directs
chromosome: genetic
chloroplasts: convert energy from sun
cell membrane: controls
cytoplasm: holds
1 yard is 91.44 centimeters