Lab Activities A. PASSIVE TRANSPORT: DIFFUSION (15 MIN) 1. Predict the effect of
ID: 3475262 • Letter: L
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Lab Activities A. PASSIVE TRANSPORT: DIFFUSION (15 MIN) 1. Predict the effect of the following factors on the rate of diffusion by indicating which of the following scenarios will be faster. Circle the one that you think will be faster. Justify your answer using what you wrote in the pre-lab activity B3 Justification glucose (C6H1206) concentrationconcentration difference (gradient) is low (gradient) is high oxygen (02) difference diffusion diffusionn medium is oilmedium is water 28 C 37 C membrane thickness is 2 thickness is 10 cell membrane cell membrane is smooth (less has microvilli surface area) (more surface area) Summarize your predictions from the previous table. What kinds of things will make diffusion faster? 2. B. PASSIVE TRANSPORT- DIFFUSION AND OSMOSIS 1. OSMOSIS (15 min) The diagram on the right represents a container that is separated into two compartments by a membrane (dotted line). This membrane is permeable to water but nothing else Label the diagram to reflect that we are filling the chamber on the left with 10% N 10gr. of NaCl in 100 mL of water) and the chamber on the right with pure water Which chamber will have the highest concentration of salt? Can salt cross this membrane? Which chamber will have the highest concentration of water? Can water cross this membrane? Which direction will the water want to go? Draw an arrow to indicate the direction. What will happen to the uul of watov in each side th, contains 100Explanation / Answer
1. Oxygen will diffuse faster, as it is a much smaller molecule than sugar and can easily move through the pores of the cell membrane.
Diffusion will be higher with higher concentration gradient, as the driving force is higher (as stated by Fick's laws of diffusion).
Diffusion will be faster in water as it is less viscous, thus providing lower resistance to the flow of the diffusing molecules.
Diffusion is faster in higher tempratures due to increased Brownian motion.
Diffusion is faster through thinner membranes (Fick's law).
Microvilli- as higher surface area leads to higher rate of diffusion.
2. Diffusion is higher incase of smaller molecules in higher temperatures, across a thin cell membrane with high surface are and with high concentration gradient on the two sides of the membrane.
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