Ineed i have a bad grade in biology so im doing missing work

1) The gel electrophoresis technique exploits the difference in size and charge of different molecules in a sample. The DNA or protein sample to be separated is loaded on to a porous gel placed in an ionic buffer medium. On application of electric charge, each molecule having different size and charge will move through the gel at different speeds. The porous gel used in this technique acts as a molecular sieve that separates bigger molecules from the smaller ones. Smaller molecules move faster across the gel while the bulkier ones are left behind. The mobility of the particles is also controlled by their individual electric charge. Two oppositely charged electrodes that are part of the system pull molecules of towards them on the basis of their charge.

3) DNA migration in gel electrophoresis. Gel electrophoresis uses electricity to separate fragments of DNA based on their length. ... The negative charge on the sugar-phosphate backbone of DNA polymers cause them to migrate towards the positive electrode when placed in an electrical field.

Explanation:

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

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