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Fed [463]
3 years ago
8

Since viruses are typically 20-200 nm in diameter, the ____ microscope is best for viewing them.

Biology
2 answers:
meriva3 years ago
8 0

Answer:

Since viruses are typically 20-200 nm in diameter, the Electron Microscope is best for viewing them.

Explanation:

Viruses are very smallest in structure to see, so we can't see them with light microscope. Electron Microscope having higher resolution capacity, so they are best to seeing viruses.

The Electron Microscope using electrons to see specimen instead of lights and an electron detector. Electron behave as light so electron beam helping us to see very small scale specimen.

The Electron which are present on microscope has ability of wave (with a wavelength) that is very smaller than visible light. With the help of this wavelength we can see the distinguish feature of viruses in nanometer.

Electron Microscope are mainly three types:

1) Scanning electron microscope (SEM).

2) Transmission electron microscope (TEM).

3) Scanning Transmission electron microscope (STEM).

tatyana61 [14]3 years ago
3 0

Electron is the best way for viewing them

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3 years ago
In a dihybrid cross for round and yellow seeds (RrYy x RrYy), what is the probability of having green and wrinkled seeds?
Virty [35]

Answer:

The probability of having green and wrinkled seeds is equal to 6.25%

Explanation:

Here R allele is dominant over r allele and Y  allele is dominant over y allele.

Thus, a green phenotype will have genotype rr

and a wrinkled phenotype will have genotype yy

The punnet square representing the cross between RrYy  and  RrYy is as follows -

RY         Ry         rY         ry

RY RRYY RRYy RrYY RrYy

Ry RRYy RRyy RrYy Rryy

rY RrYY RrYy rrYY rrYy

ry RrYy Rryy rrYy         rryy

Out of all 16 offspring, only one offspring with genotype "rryy" represents green and wrinkled seeds.

Thus,  the probability of having green and wrinkled seeds is equal to

\frac{1}{16} * 100\\= 6.25%

7 0
4 years ago
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What is the difference between the sympathetic and parasympathetic division of the nervous system?.
Papessa [141]

Answer:

The sympathetic nervous system is involved in preparing the body for stress related activities; the parasympathetic nervous system is associated with returning the body to routine, day-to-day operations. The two systems have complementary functions, operating in tandem to maintain the body's homeostasis.

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How can you measure the volume of an object if it is not shaped like a box? 
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Which of the following is the best example of how factors within a person's environment can influence their personal health?
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A

A person's environment can influence their personal health such as<u> exposure to certain chemicals increasing the risk of cancer.</u>

<u></u>

Explanation:

The environment has a significant influence on the expression of the gentoype of an organism to cause its phenotype.

Living in a toxic environment will also cause increased risk to diseases. This is because there is the presence of mutagens in a toxic environment. Mutagens, like lead, arsenic, ultraviolet rays, and etc, cause an increased risk of mutations in a population. Increased mutation rates means increased chances of developing cancer in the population.  

Learn More:

For more on environmental influences on genotype check out;

brainly.com/question/14147755

#LearnWithBrainly

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4 years ago
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