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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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Which statement correctly describes cancer formation?
AleksandrR [38]

Answer:

Cancer is formed when there are mutations in a number of genes.

Explanation:

Malignant tumors are gene diseases which do not mean that cancer is necessarily an inherited disease (only in 5-10% of cases the cancer is inherited) because the vast majority of other tumors are the result of somatic, ie secondary, mutations that lead to malignant transformation.

Only 2% of human diseases are monogenic (caused by a change in one gene). The remaining 98% of the disease is either polygenic (caused by a change in several genes at the same time) or epigenetic (caused by non-genetic or post-genetic disorders of cellular molecules).

4 0
2 years ago
Which linkages would you expect to find at a branch point in glycogen or amylopectin?
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α-1,6-glycosidic linkage.

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Thus, the answer is α-1,6-glycosidic linkage.

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