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Arlecino [84]
3 years ago
15

Meselson and Stahl's experiments proved that DNA replicates by which mode?

Biology
1 answer:
Irina18 [472]3 years ago
6 0

Answer:

Semi-conservative

Explanation:

Meselson–Stahl experiment proved that DNA replication is a semiconservative process, feeding E. colo bacteria with different types of Nitrogen isotopes (N14 and N15).

Changing the type of radioactive compound in different times of bacteria grow, they could observe that both of the isotopes were present on the bacteria culture.

Basically, if the bacteria present both of them, the DNA was replicated semiconcervely.

Guess what? they show both! (See the image for more information)

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All cells contain genetic material <br><br><br> True<br><br> False
ivann1987 [24]

Answer:

No

Explanation:

The nucleus is where cells store their DNA, which is the genetic material, Right? Well,  Prokaryotic cells do not have a nucleus. So, therefore (lol) they do not have genetic material.

Your welcome, Love.

5 0
2 years ago
What causes formation of the fertilization envelope?
Sonja [21]

Answer:

Sperm-egg interaction

Explanation:

The formation of fertilization envelope is well-studied on the model system- sea urchin. It has been shown that, the fertilization envelope is formed after the initial sperm-egg interaction from the egg surface vitelline envelope and the paracrystalline protein fraction which is derived from cortical granules. Secretion from cortical granules, prevents polyspermy.

4 0
3 years ago
Your heart has four valves. Normally, these valves open to let blood flow through your heart, and then shut to keep it from flow
Ulleksa [173]

Regurgitation influences the flow of blood by mixing the oxygen-poor blood with the oxygen-rich blood. Due to this, the heart has to pump more to oxygenate the entire body, leading to the rapid, and fluttering heartbeat. The tissues get oxygenated but regurgitation could be fatal, as the heart cannot function overtime forever.  

Valve prolapse influences the flow of blood when the flow of blood backs up. This leads to an irregular or racing heartbeat. Even at certain occasions, the blood can flow back to the lungs. However, there is not a huge influence in the oxygenation of the body tissues.  

Stenosis makes the ventricles to pump overtime to get enough blood through, and in the process, the ventricles thicken. This functions for a while, however, it will result in heart failure as the heart cannot do it for entire life. The tissues are oxygenated, but it will be an issue due to overtime.  


7 0
3 years ago
What is the highest energy phase naturally on earth.
emmasim [6.3K]
The answer would be gas I believe 
3 0
3 years ago
1 Predict) Have you met a woman who was pregnant? Write a short answer describing what type of development you think is going on
crimeas [40]

Answer:

Pregnant have many characters and when the embryo going to be develop her physical appearance like her weight will be increase . And in the pregnant women have high progesterone so she may have stomach cramps .

5 0
2 years ago
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