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3 years ago

How does the process of gel electrophoresis separate DNA fragments?

2 answers:

7 0

DNA is negatively charged due to its phosphate groups. Gel electrophoresis has one side that is positive and other that is negative. Once dna fragments are placed inside. The bigger fragments will move towards the positive side since positive is attracted to negative.

scoundrel [369]3 years ago

3 0

Answer:

For the separation of DNA fragments we use gel electrophoresis.

Explanation:

Since DNA fragments are negatively charged molecules they can be separated by forcing them to move towards the positive electrode anode under an electric field through a medium or matrix. The most common matrix is agarose. The DNA fragments separate according to their size through sieving effect provided by the agarose gel. Hence, the smaller the fragment size, the farther it moves. The separated DNA fragments can be visualized only after staining the DNA with a compound known as ethidium bromide followed by exposure to UV radiations. You can see the bright orange colored bands of DNA in a ethidium bromide stained gel exposed to UV light.

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the outer ear channels sound waves down the external __________ to the __________, a tight membrane that vibrates in response to

aivan3 [116]

Answer:

Revisado por: Larissa Hirsch, MD

Larger text sizeLarge text sizeRegular text size

in English

Ears

¿Qué es el oído y qué hace?

El oído consta de tres partes diferentes, que funcionan conjuntamente para captar sonidos y transmitírselos al cerebro: el oído externo, el oído medio y el oído interno.

El oído externo

El oído externo está formado por el pabellón auditivo (también conocido como "pabellón auricular" o "pabellón de la oreja") y el conducto auditivo. Los pabellones auditivos son las partes visibles que tenemos a ambos lados de la cabeza y están compuestos por cartílago duro cubierto de piel. La principal función del pabellón auditivo consiste en captar sonidos y conducirlos hacia el conducto auditivo, que conecta con el oído medio. Las glándulas de la piel que recubren el interior del conducto auditivo fabrican cera o cerumen, que protege este conducto, eliminado la suciedad y ayudando a prevenir posibles infecciones.

El oído medio

El oído medio es una cavidad llena de aire que transforma las ondas sonoras en vibraciones y las transmite al oído interno. El oído medio está separado del externo por el tímpano (o membrana timpánica), una fina lámina de tejido que va de lado a lado del conducto auditivo y que está fuertemente tensada sobre él. Los sonidos golpean el tímpano, haciendo que se mueva.

Explanation:

4 0

2 years ago

Aldosterone ________.

egoroff_w [7]

A. presence increases potassium concentration in the blood

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3 years ago

In the rat, the allele for red eye colour is dominant over the alleles for brown colour. Consider a cross between a rat that is

chubhunter [2.5K]

Answer:

1) RR x rr

2) Shown below

3) 100% Rr with red eyes

4) Punnett square shown (Rr x Rr)

5) 25% of the offspring are h0m0zygous dominant with red eyes (RR), 50% are heterozygous with red eyes (Rr), and 25% are h0m0zygous with brown eyes (rr)

Explanation:

Let's say the allele for red eyes is R and the allele for brown eyes is r.

1. A cross between a h0m0zygous dominant (two copies of the dominant allele, R) and h0m0zygous recessive (two copies of the recessive allele, r) is: RR x rr

2. R R

r Rr Rr

The F1 generation is shown in the Punnett square above.

3. The F1 generation are 100% Rr. They are heterozygous. Since red (R) is dominant, the rats all have red eyes

4. A cross between the F1 generation (Rr x Rr) gives the F2 generation

R r

R RR Rr

r Rr rr

5. 25% of the offspring are h0m0zygous dominant with red eyes (RR), 50% are heterozygous with red eyes (Rr), and 25% are h0m0zygous with brown eyes (rr)

6 0

2 years ago

What puts pressure on the cell wall to make the plant stand up?

wel

I'm pretty sure it would be B, because it can't be any of the others.

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3 years ago

In examining oil paintings with IR light, some of the pigments are not transparent and absorb IR light. One of these non-IR tran

cupoosta [38]

Answer: The questions are incomplete, here are the options gotten from another website.

A. Titanium oxide white.

B . Copper containing green.

The correct option is copper containing green.

Explanation:

Non infrared light pigments are pigments that are not transparent that they are opaque, u can't see through them and does not absorb infrared light like copper containing green because the copper containing green is crystalline in visible light and this make it not to be transparent in infrared spectrum and does not allow infrared light through them.

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2 years ago