What process is the fastest way to produce copies of dna?

1 answer:

8 0

PCR, polymerase chain reaction, is the fastest way to artificially (in a laboratory) multiply few copies of DNA into many, in order to create enough of a sample to use for other genetic testing.
It is used quite often in forensic science, such as magnifying a small recovered sample of DNA from body fluids or tissue samples at a crime scene, into a vastly greater quantity of DNA for identification of suspect(s) or victim(s).

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what is wrong with the following statement? "Science has proven that energy must always be conserved."

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Why do resistant bacteria multiply faster after a patient has taken antibiotics compared to a healthy person who has not taken a

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Answer:

When patient takes in antibiotics the resistance bacteria gets a competitive survival advantage over the normal sensitive bacteria and hence grows faster.

Explanation:

Bacteria can acquire resistance by taking in plasmids containing MDR (Multi-Drug Resistance) gene cassettes. The MDR genes produces proteins that can:

Render the antibiotic ineffective to act on its target by inducing chemical modifications on the drug.
Promote efflux of the drug from the bacterial cell so that the drug cannot act upon its target.

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A competition develops for the host cells and nutrients between the sensitive and the resistant variety.
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When a person (having prior antibiotic exposure), gets infected by bacteria ( both sensitive and resistant varieties) and is exposed to the same antibiotic:

The sensitive variety, due to its sensitivity towards the drug, gets killed.
The resistant variety, due to its MDR genes, bypasses the lethal effect of the drug and survives.
These surviving resistant bacteria can now infect all the available host cells and utilise all the available nutrients without facing any competition and multiply rapidly.

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