I believe the best answer is D( STEP F )
Cancer cells are the best target to amplify the most within first 2 hours. Highly oncogenic retroviruses are recombinants of viral and host genes.
Retroviruses are viruses with RNA rather than DNA in their genomes that infect cancer cells. Reverse transcriptase is an enzyme that is used to integrate into the DNA of the host cells. It is enhanced to a greater extent the more cell replication takes place. More retroviruses are then produced by the cell, infecting further cells. Many diseases, including AIDS and various types of cancer, are linked to retroviruses.
Low-incidence cancer-causing retroviruses lack inserted host information. Instead, it seems that they alter the expression of potentially carcinogenic host genes, which in turn results in cancer. Retroviruses incorporate proviral DNA into the chromosomal DNA of their host during the course of their regular life cycle. Integrations take place across numerous locations. Although most integrations are benign, some can cause cancer. Many of these seem to encode tyrosine phosphorylating protein kinases.
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Answer: A.) Scientists change the names of taxonomic groups to math current nomenclature.
Explanation: I just took the same quiz & that was right.
Answer:
c) labeled DNA ... DNA
Explanation:
Hersey and Chase prepared two separate virus samples and infected the host cell, <em>E. coli</em>, that was present into different culture media. One of them contained a radioactive isotope of phosphorus (³²P) and the other contained a radioactive isotope of sulfur (³⁵S). After a division cycle in bacteria, all the viruses recently formed had one of the two isotopes depending on the culture media in which infected bacteria had grown. Viruses coming from bacteria incubated with ³²P had radioactive DNA whereas viruses coming from bacteria incubated with ³⁵S had radioactive proteins. This was due to the differences between the structures of the DNA and proteins: DNA contains phosphorus, but not sulfur and the proteins contain sulfur in cysteine and methionine, but not phosphorus.
After incubation, the cells were centrifugated to separate any extracellular viral material. Hersey and Chase found out that ³⁵S remained outside of the bacterial cells, in the empty capsids, and that ³²P had entered the cells and was present in the new viruses formed. They concluded that the genetic material was DNA and not the proteins.