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BlackZzzverrR [31]
2 years ago
13

Gel electrophoresis is normally set up with the negative electrode at the top of the gel and the positive electrode at the botto

m of the gel. The DNA products are loaded at the top of the gel, and then a current is applied to separate them. However, when preparing to run a gel, you accidentally switched the locations of the negative and positive electrodes such that the positive electrode is at the top and the negative electrode is at the bottom. You still loaded the DNA products at the top of the gel as normal. What result are you most likely to observe if you apply an electric current to this gel setup?
A) Shorter DNA molecules will move up the gel, and longer DNA molecules will move down the gel.
B) All DNA molecules will migrate up the gel toward the positive electrode.
C) Longer DNA molecules will move up the gel, and shorter DNA molecules will move down the gel.
D) All DNA molecules will migrate down the gel toward the negative electrode.
Biology
1 answer:
vredina [299]2 years ago
4 0

Answer:

B) All DNA molecules will migrate up the gel toward the positive electrode.

Explanation:

Because the DNA has a negative charge - regardless the size-, all DNA molecules will migrate towards the positive electrode, at the top of the gel. This is due to the Coulomb's physic law  "force of the interaction between the charges is attractive if the charges have opposite signs".

Instead of migrate down the gel , the DNA will do migrate up the gel (opposite direction).

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Answer:

b. actively transport Cl- from the ECF to the external environment.

Explanation:

Chloride cells are cells that are found in the gills of teleost fishes which pump large amount of sodium and chloride ions out from the extracellular fluid (ECF) into the sea or environment against a concentration gradient in marine fish.

The opposite of this process occurs in freshwater fishes where the gills of freshwater teleost fish, cause an influx of sodium and chloride ions into the fish from the environment, also against a concentration gradient.

Mechanism of action

Salt water teleost fishes take in large amounts of seawater to decrease osmotic dehydration. The excess of ions derived from seawater is thrown out of the teleost fishes through the chloride cells. These cells employs active transport on the basolateral (internal) surface to diffuse in chloride, which then is pumped out of the apical (external) surface, straight into the surrounding environment. Such mitochondria-rich cells are located in the region of the gill lamellae and filaments of teleost fish.

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7. The natural differences between individuals of a species are referred to as
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Answer: Natural variation.

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3 years ago
Fireflies emit flashes of light because of chemical reactions, which occur in their abdomens. The rate of the chemical reactions
damaskus [11]

Since the rate of flashing depends on the rate of reaction, it means that fireflies will flash slower during cold weather.

<h3>How does temperature affect rate of reactions?</h3>

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Thus, since the rate of flashing in fireflies depends on the rate of reaction, cold temperature means that the rate of flashing will be low as compared to warm temperature.

In other words, fireflies will flash lower during cold weather and vice versa.

More on temperature and rate of reactions can be found here: brainly.com/question/16717828

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2 years ago
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The answer would be B, The weight of the object on planet A will be greater than the weight of the object on planet B.

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This is also correct because I got it right on my test, hope this helps.

3 1
3 years ago
Read 2 more answers
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