1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
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.
You might be interested in
What is the Meaning of racism
Lynna [10]

Answer: racist is when people don't value a person with different skin color

Explanation:

Also racist is when people treat a person with different skin color diffrent

this is going all around the world

where someone has different skin color than you

and you dont like them

Hope this helps :)

8 0
3 years ago
Read 2 more answers
Which situation is most likely an indicator that an economy has reached a
Kruka [31]

Answer:

After months of consistently rising, the unemployment rate stayed the same for two months in a row.

Explanation:

A P E X Answer

6 0
3 years ago
Read 2 more answers
When did world war2 happen
RSB [31]
World War 2 started in 1939, when Nazi Germany invaded Poland
4 0
3 years ago
I don’t really understand what this means . can y’all help me please
laiz [17]

Answer:

So it's asking if the legislation thinks of peples needs before passing laws. You have two choices, the government regards peoples choices, or not.

Explanation:

7 0
2 years ago
"Habilis like fossils were also found in Africa, however they exhibited slight variations of the cranium and post cranial remain
Naya [18.7K]

Answer:

It is true

Explanation:

The Homo Rudolfensis has many morfological changes. Some scholars think it is a new species.

8 0
3 years ago
Other questions:
  • How does this legal document from 1672 illustrate the roll of the Christian religion in early New England colonies
    10·2 answers
  • Some chiefs are elected, but the chief's position is usually __________. A. elected B. inherited C. appointed D. distributed by
    11·2 answers
  • The reliance on civil servants to manage tax collection in the Roman Empire is an example of?
    14·1 answer
  • What are Two examples of periodization
    15·1 answer
  • Which action is linked to the spread of the black death to Europe during the 14th century
    6·1 answer
  • Which of the following is the definition of master planning?
    6·1 answer
  • What was one important feature of Louis Sullivan's skyscrapers? BRAINLIST FOR CORRECT ANSWER.
    12·2 answers
  • Summery about the cold war
    6·1 answer
  • Does this violate the first amendments freedom of religion? why or why not?
    9·1 answer
  • What is the worst example of modern globalization as it relates to business?
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!