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avanturin [10]
3 years ago
5

Why is heating and cooling necessary when doing the pcr method?

Biology
1 answer:
pav-90 [236]3 years ago
4 0

A PCR is used to amplify DNA. The heating breaks the hydrogen bonds and ensures that the double-stranded DNA helix is melted such that the two strand separate. The cooling ensures that the introduced DNA primers bind with the single strands so that elongation of the chain (to form a new double helix) can be possible by DNA polymerase.

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Difference between the sea anemone and hydra​
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7 0
2 years ago
If an atom has twelve electrons, how many electrons are in the n=1 energy level? how many electrons are in the n=2 energy level?
Serjik [45]

Magnesium has 12 electrons.........which wud mean that in the 1st energy level(n=1) there r 2 electrons, in the 2nd energy level(n=2) there r 8 electrons and in the 3rd energy level(n=3) there r 2 electrons.......its simple......use the formula 2n^2 where n= 1,2,3,......  

so the electron configuration of Magnesium in 2,8,2..................or more precisely 1s2, 2s2, 2p6, 3s2

8 0
3 years ago
A group of living things that live in the same place at the same time is<br> best described as a:
Amiraneli [1.4K]

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6 0
3 years ago
If a strand of DNA has 24% T, what percent will be G?
galben [10]
If one strand of DNA has 24% T, it would have 26% G.
7 0
2 years ago
Read 2 more answers
Your first cousin died of tay-sachs disease (autosomal recessive, incidence 0.09%). you are not affected, nor is anyone else in
AlexFokin [52]
<span>25%

   Starting from my First cousin family, I know for sure that the Uncle is is a carrier (Aa) and he must have married a wife who is also a carrier (Aa) and that is how they got an affected son. Thus, this leads to the fact that either both of my grandparents are carriers (Aa x Aa) or only one of them is a carrier (Aa x AA). As a result, the chances that my mom (who is related to the uncle who has a defected child) is a carrier is either (2/3 or 1/2) depending if my grandparents genotype, respectively. Thus, if my mom chances of being a carrier is 1/2 then my chance of being a carrier is 1/4. (given that my dad is not a carrier b/c CF is a rare disease) However, if my mom chance of being a carrier is 2/3 then my chance of being a carrier is (2/3)x(1/2)=(1/3) As a result, I could either be 1/4 or 1/3. But since the answer only provide the choice of 1/4 and not 1/3. This leave 25% is the correct answer.</span>
5 0
3 years ago
Read 2 more answers
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