Evaluate the paragraphs below and choose the correct term to complete the sentences that discuss the interdependence of biogeochemical cycles.
stomach ulcers
proliferation
colorectal
cell cycle
bacteria
half
brain
proliferation
DNA repair
colibactin
The first research into whether cancer may be caused by a virus began over 100 years ago with the Rous sarcoma virus. Now we know that viruses are able to override the default signal to the when pathways have been disrupted, and they suppress mechanisms thus increasing mutation rates.
We know that products can also cause cancer by similar mechanisms. either directly or indirectly. Certain strains of E. col synthesize a DNA-damaging compound called that when taken up by intestinal cells, causes breakage of the DNA strands. These microbes have been found in human tumors.
Helicobacter pylori is usually known for causing – but some strains produce a protein Caga that upregulates the genes responsible for cell survival and blood vessel formation all necessary qualities for tumor formation