When a gel is stained with a DNA-binding dye, the DNA fragments can be seen as bands ... At the molecular level, the gel is a matrix of agarose molecules that are held ... the DNA fragments will glow, allowing us to see the DNA present at different ... By comparing the bands in a sample to the DNA ladder, we can determine ...

Explanation:

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3 years ago

Tion 5.

Sedaia [141]

A cell membrane pump helps human cells to maintain a relatively constant sodium and potassium concentration.

Option: A

Explanation:

Sodium potassium pump is a plasma membrane protein that utilizes energy ATP — Triphosphate Adenosine turning into ADP — Adenosine Diphosphate to deliver intracellular and extracellular sodium (NA+) and potassium (K+) ions sequentially. The purpose of this entire mechanism is to preserve cell equilibrium.

The extracellular medium has a greater concentration of Na while the K concentration of the intracellular fluid is lower. Proteins trap sodium ions in the cytoplasm and pump them out from the cells to preserve cell stability while preserving concentrations. Within the cells proteins inject potassium ions into the cell.

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3 years ago