Poly-ubiquitinated proteins are frequently targeted to the proteasome, a cellular organelle where proteins are kept until needed by the cell
true
false
During N-linked glycosylation, a carbohydrate side chain is attached through a Nitrogen atom at the amino group of Serine or Threonine
True
False
The signal sequence that targets proteins for insertion into the Endoplasmic Reticulum is rich in hydrophobic aminoacids and is most frequently located at the N-terminus of the protein
True
False
Poly-ubiquitinated proteins are frequently targeted to the proteasome, a cellular organelle where proteins are kept until needed by the cell
true
false
During N-linked glycosylation, a carbohydrate side chain is attached through a Nitrogen atom at the amino group of Serine or Threonine
True
False
The signal sequence that targets proteins for insertion into the Endoplasmic Reticulum is rich in hydrophobic aminoacids and is most frequently located at the N-terminus of the protein
True
False
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Can someone please help me with the following questions.
Question 6
Proteins can be regulated by removing phosphate groups that modify specific amino acids in their sequences. This removal activity is exerted by
| a. | Protein Phosphorylases | |
| b. | Protein Phosphatases | |
| c. | Protein Kinases | |
| d. | Protein Phosphoproteases |
Question 7
Proteolytic processing is a(n)
| a. | requirement for protein insertion into membranes | |
| b. | type of covalently-linked post-translational modification | |
| c. | irreversible post-translational modification | |
| d. | type of reversible post-translational modification | |
| e. | frequent consequence of heat denaturation |
Question 8
Allosteric regulation involves
| a. | the binding of a protein to a regulatory subunit | |
| b. | the binding of a regulatory molecule to the active site on an enzyme | |
| c. | the binding of a regulatory molecule to a site on an enzyme that is distinct from the catalytic site | |
| d. | the binding of GTP to an enzyme to regulate its function | |
| e. | the binding of a Ubiquitin-like protein to an enzyme |
Question 9
During N-linked glycosylation, a carbohydrate side chain is attached through a Nitrogen atom at the amino group of Serine or Threonine
True
False
Question 10
The signal sequence that targets proteins for insertion into the Endoplasmic Reticulum is rich in hydrophobic aminoacids and is most frequently located at the N-terminus of the protein
True
False
Please please I reallly need some help!!!!
Question 1
During which stage of translation does translocation usually occur in mammalian cells?
| a. | Initiation | |
| b. | Elongation | |
| c. | Termination | |
| d. | Binding |
Question 2
The attachment of lipids to proteins usually allows the proteins to be anchored at the Endoplasmic Reticulum
True
False
Question 3
N-linked glycosylation attaches a complex carbohydrate onto the
| a. | amino group of asparagine | |
| b. | free amino group at the amino terminal end of the polypeptide | |
| c. | hydroxyl group of serine | |
| d. | amino group of lysine |
Question 4
Most glycoproteins in eukaryotic cells are destined for incorporation into the nuclear membrane
True
False
Question 5
In a major protein degradation pathway in the cell, a short polypeptide called ___________ is attached to a protein to target it for destruction
| a. | Ubiquitin | |
| b. | Signal Peptidase | |
| c. | Disulfide Isomerase | |
| d. | Glutathione | |
| e. | Ubiquinone |
QUESTION 1
One usual effect of the post-translational attachment of lipids to proteins is that the modified proteins are
| a. | subsequently glycosylated by membrane-bound enzymes | |
| b. | able to associate to membranes | |
| c. | targeted to the luminal side of the plasma membrane | |
| d. | targeted to proteasomal degradation | |
| e. | targeted to the the Endoplasmic Reticulum |
1 points
QUESTION 2
A signal peptidase
| a. | attaches a signal sequence to a growing polypeptide chain before it passes into the rough ER | |
| b. | removes the initial methionine from a polypeptide chain | |
| c. | removes a signal sequence from a polypeptide chain after it passes through a channel into the rough ER | |
| d. | attaches an acetyl group to the 5' end of a polypeptide after removal of the initial methionine |
N-linked glycosylation attaches a complex carbohydrate onto the
| a. | free amino group at the amino terminal end of the polypeptide | |
| b. | amino group of asparagine | |
| c. | hydroxyl group of serine | |
| d. | amino group of lysine |
