Topic A1.2 Nucleic acids (id: b513f0135)

本题目来源于试卷: Topic A1.2 Nucleic acids，类别为 IB生物学

[问答题]
9. Hershey and Chase used viralpviv7gop:*h qu x+(g3d t5 j1w bacteriophagesgi 5d35pbku x: to demonstrate that DNA, not protein, is the genetic material. This investigation used g:kuxbdpi53 5 radioactive phosphorus to label DNA.

Outline how radioactive labelling was used in this investigation.

参考答案:

• Radioactive labelling allows specific molecules to be observed.

• Phosphorus is found in DNA but not protein.

• Bacteriophage DNA was labelled with radioactive phosphorus.

• The radioactive label showed that the DNA part of the virus entered the (bacterial) cell.

• The radioactive labelled DNA was used to make new virus particles showing that DNA

was the genetic material passed from one generation to the next (and not protein).

• 3 marks max if the distinction between protein and DNA as the genetic material is not

clear in the answer.

本题详细解析: 暂无

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