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RQ6 - CHEN 4820 Reading Quiz Harrison ch 5(sedimentation...

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CHEN 4820 Reading Quiz Harrison ch 5 (sedimentation, centrifugation) Pledge: On my honor, I have neither given nor received aid on this quiz. Print name: _________________________________________ Signature: __________________________________________ Quiz: Select the one option that best answers the question by circling the letter in the box next to that answer. Q1. What is hindered settling? A It is the diminished settling speed resulting from the intermittent contact between particles and a solid wall or surface that is parallel to flow, also known a wall-effect. B It refers to the phenomenon where the drag force on the particle is higher due to the tumbling action of the particles as they fall. C It refers to the phenomenon where it is observed that the settling speed of a group of suspended particles is slower than the speed of a single particle alone. D It refers to the reduction in settling speed due to the buoyancy provided by a thin gas film that typically surrounds small particles, owing to surface tension. A1. Answer C Hindered settling was at first counterintuitive to me, but we live in a high Re world (I am very big compared to a yeast cell, and so is my Re when I move around), where my car can “draft” behind a truck on a highway and save gas (not recommending this style of driving-TKB). Cells live in a different low Re world where viscosity rules.
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