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Reika [66]
2 years ago
9

Hi I have a question, answer and I will brainliest

History
1 answer:
Lynna [10]2 years ago
8 0
Membranes are primarily composed of a bilayer of lipids (fats).


In addition to lipids, there are proteins, carbohydrates, and combinations of the three within the bilayer, but the barrier that separates the cell from its exterior environment is established by the lipids. It is called a bilayer because, as you can see in the above image, it is formed by sheets of lipids in opposite conformations. How does this occur? By the nature of the lipid - having a polar, hydrophilic head, and a long, hydrophobic. The cells in a sample are separated from each other, often by a physical means such as grinding or vortexing, and put into a solution containing salt. The positively charged sodium ions in the salt help protect the negatively charged phosphate groups that run along the backbone of the DNA.

A detergent is then added. The detergent breaks down the lipids in the cell membrane and nuclei. DNA is released as these membranes are disrupted. To get a clean sample of DNA, it’s necessary to remove as much of the cellular debris as possible. This can be done by a variety of methods. Often a protease ( protein enzyme) is added to degrade DNA-associated proteins and other cellular proteins. Alternatively, some of the cellular debris can be removed by filtering the sample. Finally, ice-cold alcohol (either ethanol or isopropanol) is carefully added to the DNA sample. DNA is soluble in water but insoluble in the presence of salt and alcohol. By gently stirring the alcohol layer with a sterile pipette, a precipitate becomes visible and can be spooled out. If there is lots of DNA, you may see a stringy, white precipitate. The DNA sample can now be further purified (cleaned). It is then resuspended in a slightly alkaline buffer and ready to use.
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English colonists tried to stop enslaved Africans from gaining their freedom
katrin2010 [14]

Answer:

i think its D because the above arent necessarily true as someone who lives in a once colonised country

3 0
2 years ago
“30 days of minimum wage.” I give Brainliest!
Sonbull [250]
1. Ohio, because they are experimenting the lifestyle of a worker living on minimum wage in the heart of the Midwest.

2. The first thing they did when they got there was they found an apartment within their $400 per month budget.

3. The second thing they did was they begun the search for jobs. Alex discovered a job at a local coffee shop and Morgan registered with a Temporary Employment Agency.

4. To find a job. Morgan will make at least $7 per hour there.

5. Sorry, not sure about this one but possibly $400 since it’s their monthly budget?

6. I think McDonald’s because he had a “McJob”. I know that he made pizzas, washed dishes, worked as a landscaper, painted, and made boxes.

7. I believe $15.

8. 1938

9. Because 2005 America is not the same as 1938 America. Economics have changed, as has the value of the dollar, the amount needed to live decently, and just everything has transformed since 57 years ago.

10. Infested with ants.

Hope this helps :)
7 0
3 years ago
How did plato’s opinion of democracy differ from that of Socrates?
aksik [14]

Answer:

through love and have dodooo

7 0
3 years ago
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Which was a drawback of the Weimar Republic? The President was dictatorial and people did not enjoy any freedom. Women were not
allsm [11]

<span>A drawback of the Weimar Republic is that The Weimar Government did not have a constitution. After the First World War, the Weimar Republic attempted to create a perfect democracy in the country. Having no constitution became a drawback because there is no law to guide the people and they are all free to do what they want. No restrictions, No limitations.</span>

7 0
3 years ago
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How did the Soviet unions boundaries change between 1920 and 1960s ?
ozzi

Answer:

They changed a lot

Explanation:

7 0
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