This document summarizes key aspects of nucleic acids, chromosomes, DNA, and RNA. It notes that chromosomes contain DNA coiled around proteins, and that DNA is a polymer of nucleotides joined by covalent bonds to form a double helix with complementary base pairing between strands. It describes two types of RNA, mRNA and tRNA, noting mRNA is single-stranded while tRNA folds back on itself with some base pairing. tRNA is described as having a cloverleaf shape with standard length, an amino acid binding site, anticodon, and hydrogen bonds between base pairs.