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3 years ago

How is DNA fragment length measured?

2 answers:

4 0

gel electrophoresis. This method relies on the fact that DNA fragments are charged, and it is an alternative to more expensive methods, such as X-ray crystallography, which was responsible for the discovery of the double-helix structure of DNA.

to determine the sizes of these unknown fragments, scientists usually plot a graph. On the x-axis is the distance traveled by each band in the ladder in millimeters, while on the y-axis is the size of each band. When the points are connected by a curve, the size of any band can be extrapolated from the curve after measuring the distance traveled by that band in millimeters.

Hope this helps :)

jonny [76]3 years ago

3 0

Answer: Its measured with the use of gel electrophoresis.

Explanation: Scientists use a method known as gel electrophoresis to measure the lengths of DNA fragments. Electrophoresis works because fragments carry a small charge.

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Match the physical characteristics of the organisms to their purpose.

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OLEGan [10]

Answer:

Water sample showing pink/purple color is an error.

Explanation:

Biuret is a blue color reagent that changes its color to pink/purple whenever it detects protein in a sample. Water don't contain proteins so it should not show pink/purple color instead it should maintain the blue color. Food items generally contain proteins so it show pink/purple color but it showed blue color.

Error might have caused by wrong marking of the samples, test tube marked with Water might contain a mystery food while Mystery food tube might contain water.

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Answer:

Water

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Water is a renewable energy source used to generate electricity. A place where this happens at is dams.

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1 Populations that show uniform dispersion typically show the following characteristics EXCEPT:

professor190 [17]

1. Answer: C

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2. Answer: B

Explanation: While the clumped up populations may be inclined to cooperate in tasks such as food gathering, such distribution results to increases intraspecies competition especially during scarcity. This is because the individuals are close together – which is also advantageous during mating season.

3. Answer: A

Explanation: Type 3 survivorship curve is characterized by a high mortality rate early in the life of the species which gradually progresses to a low mortality rate for the individuals that survive the early stages of life. These species, therefore, bear a lot of offspring most of which will not make to adulthood.

4. Answer: B

Explanation: If the death rate of a population is higher than the birth+ immigration rate, then the population must be decreasing. This can be demonstrated by a growth curve of a population such as that of bacteria. The population starts decreasing due to increased competition for reduced resources after reaching carrying capacity - depicted by the stationary phase.

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3 years ago

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The answer would be A.DNA

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2 years ago