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anyanavicka [17]
3 years ago
12

How do proteins become embedded in the membrane of the endoplasmic reticulum?a. by splicing of proteins on either side of the ER

membrane.b. via stop- and start-transfer sequences that stop and start translocation of a polypeptide through the ER membrane, resulting in transmembrane proteins.c. by post-translational import can results in a transmembrane ER protein.d. by protein chaperones that insert polypeptides into the ER membrane.e. via transit sequences that target polypeptides made in the cytosol for the ER membrane.
Biology
1 answer:
alexdok [17]3 years ago
7 0

Answer:

The correct answer is b.

Explanation:

The signal peptide acts as an initiator of the  transfer. Proteins whose first destination is the endoplasmic reticulum have a signal peptide at their amino terminal end that includes a sequence composed of 5 to 10 hydrophobic amino acids, which is recognized by a receptor of this organelle that opens a channel in its membrane allowing such proteins to can get through it. Most of these proteins will then continue their course towards the Golgi apparatus, but those that also have a certain sequence of four amino acids (-Lys-Asp-Glu-Leu-COOH) at their other end (carboxyl terminal) are retained in the endoplasmic reticulum as proteins of this organelle. The transfer stop peptide anchors the protein on the membrane after the ER signal peptide (transfer initiator) is released from the translocator and removed.

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The form DNA must be in to be used.
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Answer:

DNA must be unwinded so it can be used for replication or to create RNA.

Explanation:

I hope this helped and if it did I would appreciate it if you marked me Brainliest. thank you and have a nice day!

4 0
3 years ago
To help you steady a rifle when you're ready to shoot draw a deep breath and
EastWind [94]
To help you steady a rifle when you're ready to shoot draw a deep breath and exhale about half of it. This is one of the Rifle-Firing Techniques. This technique<span> helps you steady the rifle for the most accurate shooting. 
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4 0
4 years ago
Read 2 more answers
An animal trainer is conditioning an elephant to startle at the sound of a trombone. Every time she plays the trombone, she then
ANTONII [103]

Answer:

The correct answer is option D, that is, the elephant will not react.

Explanation:

A kind of behavior that comprises a stimulus-response, which is distinct from the natural one is termed as conditioning. It is a kind of learned behavior. It is a kind of learning where the efficacy of stimulus enhances while provoking a response. When the presentation of two stimuli is done at a suitable time and with appropriate intensity, then one of them will be able to provoke a response that resembles the other one.  

In the given case, the mouse and the trombone are termed as unconditioned and conditioned stimuli. When a conditioned stimulus is demonstrated in a context of classical conditioning, it will result in the non-predication of the coming unconditioned stimulus. The conditioned response will get to cease slowly and will eliminate the conditioned fear. Thus, in the given case, the elephant will fail to react towards the trombone subsequently.  

8 0
4 years ago
What is needed for natural selection to occur? Select all that apply.
DIA [1.3K]
These are the answers to thisA C D E
5 0
4 years ago
Which is not the precursor for the de novo purine biosynthesis?
amm1812

The correct option is (B) Lysine.

The precursors glutamine (N2 and N9), glycine (C4, C5, and N7), aspartate (N1), co2 (C6), and folate are used to create the purine ring (C2 and C8). All are precursors to the purine ring, with the exception of lysine.

How is Purine synthesized de novo?

  • In all cells, the cytosol is where purine biosynthesis takes place.
  • There are 11 steps that are catalyzed by enzymes that build the purine ring. Each enzyme includes several monomers because it is oligomeric.
  • The reaction does not release the intermediate products that are created. They are instead transported to the next enzyme in the process.
  • The biosynthesis process in the human body can provide the body's need for purine in metabolic processes. Clinical symptoms might become unpleasant if purine synthesis is inadequate or if biosynthetic routes are aberrant.

Learn more about the Purine biosynthesis with the help of the given link:

brainly.com/question/14229639

#SPJ4

I understand that the question you are looking for is "Which of the following is not the precursor of a purine ring?

(A) Glutamine

(B) Lysine

(C) Glycine

(D) Aspartate"

7 0
1 year ago
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