Hi,
Harshey and Chase did a great experimentation which was basically a two step experiment to prove that DNA and not proteins are the actual carriers of genetic information from parents to offspring.
- In the first part of their experiment, they used bacteriophages (virus that eat bacteria). They used radioactively labeled sulphur(35S) medium to grow bacteriophages and observed that all the bacteriophages had proteins with radioactive sulphur(35S).
- In the next step they allowed these phages to infect bacteria and to their surprise, they found that the bacteria did not had radioactively labeled sulphur in them because the coat of bacteriophage stays outside the body of bacteria when it attacks it. This proved that DNA not proteins were the hereditary material.
- To make their results more reliable, they did a second experimentation in which, they marked the DNA of the phage with radioactive phosphorus 32P. After labeling DNA, they repeated the same experiment and this time, they found radioactive phosphorus inside the bacteria.
<em>This meant that the bacteria had DNA of phage entered inside them and this again proved that DNA not proteins are the hereditary material. You can see attached image for better understanding.
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Hope it help!
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Answer:
The correct answer will be option- to make exact copy of the DNA and pass on to the offspring
Explanation:
DNA replication is a complex process which produces the exact copy of the DNA which gets passed on to the generations. The process requires various enzymes and gains its energy from the ATP so is known as ATP dependent mechanism.
The process has to take place before the division of genetic material during cell division cycle so it takes place during S or synthesis phase of the interphase of the cell cycle.
Since DNA replication produces exact or replicated copies of the genome in organism therefore, to make an exact copy of the DNA and pass on to the offspring is the correct answer.
Increased exposure to X-rays
Some of the natural ways to remove allergies from the body are:
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2) small amount of local honey is able to keep away from unpleasant impacts of pollen allergies
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4) drinking extra water in case of having troubles with nasal passages can release allergic burden