Which of the following treatments with stem cells is currently most likely to be effective?

1 answer:

3 0

Bone Marrow Therapy and Core Blood Stem Cells Therapy are treatments which are most likely effective for ill patients. Bone Marrow Therapy is used for patients who has leukemia and bone marrow illnesses. While Core Blood Stem Cells is used for blood diseases as for now.

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A toad is brought into a new ecosystem. It is stronger than the toads that already live there and reproduces quickly. Which is t

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Answer:

Invasive

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it is invasive

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In what phase does the cell begin to split the cytoplasm.

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In the cytokinesis phase

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1. What happens to the ratio of surface area to volume as the cell size increases without the cell changing shape?

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As the cell size increases, the ratio of surface area to volume DECREASES.
The surface area to volume ratio refers to the area per unit volume of a cell. As a cell increase in size, the surface area and the volume of the cell also increase but at an unequal rate, a point will be reached where the ratio of the surface area to volume will be so low that the diffusion becomes very inefficient, at this point, the cell has to divide in order to increase its surface area to volume ratio and to increase its diffusion rate.

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The nucleoside analogue acyclovir, which is used to treat herpes simplex virus (HSV) infections, lacks a 3′ hydroxyl group (–OH)

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Answer:

There won't be any functional viral DNA synthesis

Explanation:

First of all, you must consider that the HSV has a double-stranded, linear DNA genome. Furthermore, the DNA skeleton is made of the 5'-3' phosphodiester bond. In other words, the 5-phosphat of a nucleotide will bond the 3' OH of the Deoxyribose (see image).

Therefore, if you add a molecule which lacks the 3' OH, such as acyclovir, and has a similar chemical structure to a regular nucleotide, the DNA polimerase will be able to add acyclovir to the main backbone of the viral genome. All in all, you'd be ''cheating'' the DNA pol.

Hence, wherever acyclovir was integrated, there won't be any chance to form a 5'-3' phosphodiester bond. The protomolecule will not be stable and will soon be degradated.

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