BIOLOGY COLLEGE

Protein phosphorylation is commonly involved with all of the following excepta. activation of receptor tyrosine kinases.
b. activation of protein kinase molecules.
c. activation of G protein-coupled receptors.
d. regulation of transcription by signaling molecules.

Answers

Answer 1
Answer:

Protein phosphorylation is not involved in activation of G protein coupled receptor.

Further Explanation:

Roles of Protein phosphorylation are :

  • To involve in signal transduction.
  • To help in membrane transport .
  • To regulate cell cycle.

G- protein coupled receptor is activated through the external signals in the forms of ligand.

In this, ligand binds to the active site and cause conformation changes in receptor and active G- protein.
Answer 2
Answer:

Final answer:

Protein phosphorylation is a key process in many biological functions but it is not directly involved in the activation of G protein-coupled receptors. Those receptors are activated by the binding to a specific signaling molecule, not phosphorylation.

Explanation:

Protein phosphorylation is a biochemical process that adds a phosphate group to a protein molecule, significantly affecting its function. Indeed, protein phosphorylation is involved in the activation of receptor tyrosine kinases, the activation of protein kinase molecules, and regulation of transcription by signaling molecules. However, phosphorylation is not directly involved in the activation of G protein-coupled receptors. Instead, these receptors are activated by binding to a specific signaling molecule or ligand, leading to a cascade of signaling events within the cell.

Learn more about Protein Phosphorylation here:

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Answers

Answer:

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Explanation:

Answer:

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Explanation:

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Answers

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Answers

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Answers

Answer:

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Explanation:

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Calculate the pI of Histidine (pKa’s = 2.3, 6.04, 9.33)6.11
7.68
3.08
2.35
4.07

Answers

Answer:

The correct answer is 7.68

Explanation:

Isoelectric point (pI) is the pH at which the amino acid has net a charge of zero. We have to choose the two values of pKa at which the neutral form of the amino acid is predominant. Histidine (Hys) is a basic amino acid. From pKa's data, we deduce:

pKa1 = 2.3 (corresponds to α- carboxyl group)

pKa2= 6.04 (corresponds to R group)

pKa3= 9.33 (corresponds to α- amino group)

Since it is a basic amino acid, the neutral form will exist between the higher pKa's values. Thus, the pI will be in a pH value between 6.3 and 9.33.

So, we have to calculate the average of pKa2 and pKa3:

pI= (pKa2+pKa3)/2= (6.04+9.33)/2= 7.68

Therefore, the pI of Hys is 7.68.

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Answers

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