Answer:
Explanation:
When a cell divides, it creates two identical daughter cells that each carry a copy of the original cell's DNA. The name for this process is mitosis, and errors in the process result in incorrect DNA copies. The effects of these errors on the health of the organism range from benign to deadly, depending on their number errors and type. One potential consequence is cancer;
I think the correct answer from the choices listed above is the first option. T<span>he scientists were concerned about the glue used to reattach the birds’ tails because they </span><span>did not know if it would hold the tails in place very long. Hope this answers the question.</span>
Chinese hamster ovary cell production of recombinant tissue‐type plasminogen activator (t‐PA) was increased by amplification of cotransfected dihydrofolate reeducates cDNA using stepwise adaptation to increasing methotrexate (MTX) concentrations. The highest producing clones were isolated at 5 μM MTX and yielded 26,000 U/106 cells/day t‐PA (43 μg/106 cells/day). Above 25 μM MTX, cell specific t‐PA production rates became increasingly variable and the cDNA copynumbers decreased. No apparent correlation between the cell specific t‐PA production rate and the growth rate was observed upon sub cloning of the amplified cells. When MTX selection was removed, the t‐PA production rate decreased up to tenfold within 40 days; this was accompanied by an up to 60% drop in cDNA copynumber. Subclones isolated after 108 days of culture in the absence of MTX were, on average, sixfold more stable than their parental cells. In culture without MTX, the maximum stable t‐PA production rate obtained (over 250 days) was 7000 ± 750 U/106cells/day (∼12 μg/106 cells/day), approximately threefold lower than the maximum unstable levels of production reached under selective pressure. Taken together, these results define a wide range of the highest t‐PA expression rates obtained under MTX selection, for which stable expression without selection has not been reported
External stimulus is an allergen. hope this helps <3
Answer: The correct answer is capillaries
Explanation:
capillaries are tiny branched blood vessels that links arterioles to venules and allows exchange of nutrients and gases between the blood and its surrounding tissues