Another application of the polymerase chain reaction (pcr) is to screen samples for the presence of viruses. for example, do you remember the ebola outbreak? a blood sample can be sent for pcr based analysis. in this instance, many copies of viral specific dna sequences are made to cross a detection threshold. each ebola virus is composed of a single strand of rna approximately 18,950 nucleotides long enclosed in a cylindrical viral envelope. in some laboratories, the first step might be to incubate the samples with the enzyme reverse transcriptase. why might this be?
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Biology, 22.06.2019 18:00, barnhill4755
The images show two species of tree frogs in a particular region. the gray tree frogs are adapted to the trees of the woodlands, while the green tree frogs can survive in woodlands or grasslands. the gray frog was abundant in the woodlands. because of climatic changes, most of the trees in the region died, and the woodlands changed to grasslands. in such a case, the . the gray tree frog is closely related to the green tree frog genetically, but they have different mating calls. this suggests that speciation occurred because of .
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Another application of the polymerase chain reaction (pcr) is to screen samples for the presence of...
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