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Reil [10]
2 years ago
5

To visualize the structure of DNA, which has a width of 10 nm, which microscope would be best

Biology
2 answers:
Grace [21]2 years ago
7 0

Answer:

<u><em>The answer is</em></u>: <u>Electron microscope.</u>

<u />

Explanation:

<em>To obtain the maximum magnification and the best resolution</em>, the electron microscope <em>must be used</em>, which can reveal details of up to a few nanometers (nm).

<em>When the thin cuts are sectioned, stained and observed with the electron microscope, a delicate membrane</em>, about 5 nm thick, <em>that surrounds the cell is visualized. </em>

<u><em>The answer is</em></u>: <u>Electron microscope.</u>

damaskus [11]2 years ago
5 0

Answer:

Electron microscope

Explanation:

Instead of using light, it utilized a beam of electron for illumination. Because an electron beam has a shorter wavelength than light (up to 100, 000 times shorter), they have a higher resolution power and are therefore able to view sub-cellular structures including DNA.

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A Xw+m+Xwm female was mated to a XwmY male. Out of 1000 total F1 progeny there were 230 flies that were otherwise wild type with
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In order to calculate the distance between two alleles/genes that are found in the same chromosome, we need to know how often crossing-over happened (recombination frequency). We know from the text that white eyes were linked to miniature wings and that wild type eyes were linked to wild type wings, so any phenotype that's contrary to these parent combinations are a result of crossing-over. We know then that 230 flies + 240 flies were a result of such recombination. To calculate the recombination frequency we only need to divide these flies (total of recombinant flies) by the total of flies in the offspring and turn it into percentage.
\frac{230+240}{1000}=0.47
0.47*100%=47%
47 map units is the distance between the genes <span>for eye color and wing length.</span>
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2 years ago
All of the following are characteristics of modern amphibians except:
Tom [10]

Answer:

Endothermic

Explanation:

Amphibians are ectothermic organisms. Ectothermic animals are coldblooded animals. From the options above, the correct answer is endothermic because amphibians are not hot blooded and are never endothermic.

4 0
1 year ago
When conducting research that involves collecting biological specimens for genetic testing, which of the following issues is the
Inessa [10]

Answer:

A) Effect of findings on other family members would be most important factor.

Explanation:

Genetic research is done on human DNA to know the genes and environmental factors associated with certain disease.

Institutional review board (IRB) is the regulatory authority to protect the rights of subjects invloved in a resaerch.

The genetic reaerches usually involve families, so the researcher subjects and the result of research is related to all subjects that cause increased information flow between subjects and effect their decision to partcipate independently in research. Also, if the research involve therapeutic studies special precautions would be taken to choose the subject

4 0
2 years ago
Which structure carries instructions for producing the proteins that help make a person’s hair curly?
Ira Lisetskai [31]
Hair cells I'm pretty sure hope it helps or maybe its genes
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1 year ago
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Ulleksa [173]

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Smooth endoplasmic reticulum differs from the rough endoplasmic reticulum in not having ribosomes on its surface. The smooth endoplasmic reticulum (SER) extends from the rough ER and forms a network of membrane tubules. The function of the smooth ER is to serve as a site for the synthesis of lipids, fatty acids, and steroids such as estrogens and testosterone.

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1 year ago
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