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 vi k6*ii+mvyi orw:3:cunndml -* -je(v v.c .ohqaug0)ral bacteriophages to demonstrate that DNA, not protein, iv..ac gq0u oh)s the genetic material. This investigation used 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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