Biol 112 Sept. 19 (C) - Biology 112 Please pick up a half sheet of paper Ready your clickers Put away laptops phones etc etc etc(thanks Questions from

1 Biology 112 Please pick up a half sheet of paper Ready your clickers P t l t h t t t Put away laptops, phones, etc etc etc. (thanks) Questions from last time? Replicating thing criteria as applied to cells: Have a container Membranes (wall) Gather raw material Gather or make parts Gather and transform energy All done by proteins Have a set of instructions DNA Pass instructions to replicas Proteins and DNA Mechanism to read the instructions RNA and proteins Let’s Talk Diffusion Diagram shows computer Simulation of diffusion (random motion) of 400 black dots. Assume that the dots represent molecules dropped represent molecules dropped into a liquid. What causes diffusion? Let’s Talk Diffusion Expected answer: “Two properties are at work: 1. The molecules are moving (kinetic energy) 2 The system will 2. The system will spontaneously tend towards more randomness, as described by the Second Law of Thermodynamics. “ 1. The mass of the diffusing particle. 2. The size of the space the particle is diffusing through. 3. The number of molecules that are in the middle initially. 4. The temperature of the system. Consider a repeat of the diffusion experiment. Which of the following will affect the rate each particle diffuses ? AA 5. The characteristics of the space the particle is diffusing through. A. All 5 characteristics B. Only 2 and 4 C. Only 1, 3 and 5 D. Only 1, 4 and 5 E. Only 2, 3 and 4 Add a drop of water soluble dye to the water layer water Non-aqueous oil What’s the barrier?