Biology Molecule

Unit 1 -man is high 50’s to 60% water -distribution in body divided into 3 compartments: 1) intracellular - 28 litres 2) intercellular/interstitial fluid - 11 litres - 80% 3) blood plasma - 3 litres - 20% -women contain less water than men -organisms can contain 60-80% water -bacteria have lots of water -fat cells have little -water’s properties result from its structure and molecular interactions -water is polar -polar covalent bonds and asymmetrical shape give it opposite charges on opposite sides -electrons spend …

…it is produced constantly -ATP molecules usually last less than a minute before being broken down -~40 kg is produced in a day -if a cell needs energy, it hydrolyses ATP and releases energy in small packets NAD: -contains ribose sugar, adenine and 2 nucleotides -one nucleotide does not contain any of the 5 bases, but instead a nicotinamide ring -they can accept hydrogens and become NADH -hydrogens are accepted or passed on during respiration or photosynthesis