3 years ago

How placenta is design to provide nutrition to developing embroy

1 answer:

5 0

The placenta is the interface between the maternal and embryo's blood, and allows for the exchange of nutrients, including oxygen and carbon dioxide exchange, but prevents certain drugs and chemicals from reaching the embryo. Its a bit like a security guard that only lets certain things though to the baby.

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Which sugar is called fiber in humans? 1: Starch 2: glycogen 3:cellulose

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You are asked to give a classroom demonstration of DNA supercoiling. To do so, you take two different colored pieces of rubber t

lesantik [10]

Answer: topoisomerases

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Topoisomerases are enzymes that help overwind or underwind DNA. DNA double helix has high tedency to get winded again because of its structural characeristics.

During replication and transcription of DNA, DNA gets overwound in front of a replication fork. This enzyme stops the double helix of DNA from becoming too tightly bound in front of the replication fork as the DNA opens.

The given demonstartion shows the action of topoisomerases as it shows unwinding of of supercoiled strands of pipe (DNA), which is don eby topoisomerases in the DNA replication process.

Hence, the correct answer is topoisomerases.

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4 years ago