Biology 2601A/B Lecture Notes - Lecture 1: Fick'S Laws Of Diffusion, Plasmolysis, Calorimetry
20 Nov 2016
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Document Summary
Temperature: intensity of atomic motion in an object: determines direction of heat transfer. Heat: amount of energy in an object. Ectotherm: rely on external temperatures for body temperature. Heterotherm: multiple temperature set points, or alternate between homeothermy and poikilothermy. Regional endothermy/heterothermy: different temperature maintained in different body parts. Convection: a fluid transfers heat (ex. wind) Conduction: a solid transfers heat (ex. touching) Respiratory: heat lost through water loss (ex. panting) Metabolic rate: m=a10nt: a and n are constants, t is body temperature, rate chemical energy is converted to heat/work, dependent on enzymes. 2: change in rate of a process measured at 10 difference, 1 means no change, 2 means double, 1 for most physical/chemical processes, 2-3 for most biological processes. Enzymes have temperature optimums: warmer = weaker binding affinity, high km = low affinity, too high affinity: too tight binding, slow reactions, too low affinity: too loose substrates, reactions unlikely.
