本题目来源于试卷: Form and Function B.4 Organelles & Compartmentalization，类别为 IB生物学
[单选题]
Which of the followi9ls.3t skpaa; rr d3xw.w1p3*,tpye6c beq3 hng is true of centrifugation?
A. It separates substances by density
B. It separates substances by charge
C. It separates substances by chemical composition
D. It separates substances by colour
参考答案: A
本题详细解析:
Centrifugation is a technique that primarily separates substances based on their density. When a mixture is centrifuged, particles or components with higher density sediment to the bottom of the tube. Choice A is, therefore, correct. Centrifugation does not separate substances based on their charge. Electrophoresis is a technique that separates particles or molecules based on their charge. Choice B is, therefore, incorrect. Centrifugation does not directly separate substances based on their chemical composition. Other techniques like chromatography may be more suitable for separating substances by chemical composition. Choice C is, therefore, incorrect. Centrifugation does not separate substances based on their colour. Colour differences might be observed during centrifugation, but they are not the basis for separation. Choice D is, therefore, incorrect.
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