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 following is true of centr1eu yx8;frk/ wn)l ls-ifugation?ox +h -p9:pe5m cy1cfi
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.
| 
