Suppose you are growing the rushing fireball in liquid culture at optimal growth temperature. You put a sample of your culture in a spectrophotometer, and its optical density (OD) is 0.8. The OD of the culture was approximately 0.2

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.