DNA, Genes, and Chromosomes
Inside almost every one of your cells sits a complete set of instructions for building and running you. Those instructions are written in DNA, packaged into chromosomes, and read in units called genes. Getting these three words straight is the doorway to all of genetics, and it clears up a surprising number of test questions. […]
Photosynthesis, Respiration, and Cell Division
Cells have to do two big jobs: capture and release energy, and make new cells. Photosynthesis and respiration handle the energy; cell division handles the copying. These three processes power and renew all life, and they show up constantly on science tests, usually as a matched set. This lesson gives you a clear, plain-language handle […]
