ANTH 1001 : Bio Lecs Exam 2
Document Summary
Fresh has no ions so hypertonic to freshwater. Endocytosis: cell engulfs object, becomes membrane bound vesicle. Chem rxns occur any time molecules collide and produce a new substance. How do cells organize and control metab rxns. Synthesis of nrg carrier molecules to store energy and transport it and reg its flow. Couple reacs together so tht unfav ones can occur at the expense of reactions that release energy. Study of the nrg relationships of a system. 1st= convert diff forms of nrg, total nrg stays constant, in a closed system. 2nd= amnt of useful energy decreases, entropy increases, bc of an increase in randomness, in a spon process. The earth is not closed, input of nrg from the sun. Chem rxns only proceed spon in the downhill reaction. Accumulate free amino acids to match the tonicity of seawater. Bacteria: thermophiles exist at temperatures up to 132c. The stability of biological molecules sets the upper temperature limit for life.
