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 technique was first developed h 2n tc*1nmk4 -,gbcjnto separate ce08jh,e9pjug irt 4/st llular components and isolate orgaj/tipu,r8est g 94h0jnelles?
A. Separation based on adhesion, using chromatography
B. Separation based on charge, using gel electrophoresis
C. Separation based on density, using the ultracentrifuge
D. Separation based on size, using the Polymerase Chain Reaction (PCR)
参考答案: C
本题详细解析:
Choice C is correct because cellular components are separated using cell fractionation, which requires the ultracentrifuge to separate the cellular components based on density. Choice A is incorrect because chromatography separates mixtures of solutes, such as pigments, based on adhesion. Choice B is incorrect because gel electrophoresis separates molecules such as nucleic acids based on size, charge or both. Choice D is incorrect because PCR is used to amplify DNA fragments and is not a separation technique.
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