Homework Answers
Question 02:
Answer:
Option b. through an aqueous channel created by the Sec61 protein.
Explanation: The Sec61 complex is a protein which provides a signal peptide with proper recognition site and a polypeptide conducting channel forms which are used for the translocation of the protein into the Endoplasmic Reticulum (ER) Lumen. Therefore, option b. is the correct answer. The other options are incorrect.
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QUESTION 2 Proteins are translocated into the ER lumen by being pushed by translation through the...
1. (1.5 pts) Entering the ER: Translocation of proteins across the membrane of the ER is usually ...
Please answer letter B!
1. (1.5 pts) Entering the ER: Translocation of proteins across the membrane of the ER is usually studied using microsomes (vesicles made from rough endoplasmic reticulum. Microsomes of the rough ER carry ribosomes attached to their outer surface. Translocation of proteins across the microsomal membrane can be assessed by several experimental criteria: (1) the newly synthesized protein is protected from added proteases, but not when detergents are present to solubilize the protecting lipid bilayer; (2) the...
Which protein modification does NOT take place in the ER lumen? A. Polyubiquitylation &nbs
Which protein modification does NOT take place in the ER lumen? A. Polyubiquitylation B. N-linked glycosylation C. Cysteine bridge formation D. chaperone-mediated folding E. GPI anchoring 2. Which of these Eukaryotic proteins is least likely to exhibit an ER import sequence during translation? A. Glutathione B. CFTR C. Protein disulfide isomerase D. Acetylcholine receptor E. Na+-K+-ATPase 3. Which function is NOT attributed correctly to either smooth ER (SER) or rough ER (RER)?...
4. Create some drawings/models of membrane transport proteins. Blob models are fine but they should be...
4. Create some drawings/models of membrane transport proteins. Blob models are fine but they should be annotated as instructed below. In your drawing include a model for a lipid bilayer clearly showing the polar and non-polar nature of the lipid components. The models of the proteins should include annotation/shading or other indication that indicates the types of amino acid functional groups you might expect to see in (a) the exterior of the protein in contact with the lipid bilayer, (b)...
Which of the following statements describing the import of proteins into the nucleus is correct? Answers...
Which of the following statements describing the import of proteins into the nucleus is correct? Answers A-D A Transport into the nucleus requires the activity of a G protein. B The receptor for nuclear proteins is found in the cytosol and travels into the nucleus with the protein being transported o ะก Proteins destined for the nucleus are transported in a fully-folded conformation. D These statements are all correct. o You are interested in a water-soluble protein that functions within...
Question 24 Which of the following categories of membrane proteins is most likely to have restricted...
Question 24 Which of the following categories of membrane proteins is most likely to have restricted lateral mobility in a membrane? enzyme transporter O anchor O receptor all are restricted Question 5 New membrane synthesis occurs by spontaneous aggregation of free phospholipids into a new bilayer incorporation of phospholipids into one face of a preexisting membrane and their specific redistribution by enzymes like flippases incorporation of phospholipids into both faces of a preexisting membrane at the same time formation of...
When a protein is co-translationally translocated into the ER it sometimes receives attachments of eight mannose...
When a protein is co-translationally translocated into the ER it sometimes receives attachments of eight mannose residues, which are added to a core carbohydrate unit consisting of GlcNAc (N-acetylglucosamine). The mannose residues are trimmed down from a unit of eight to a unit of five either in the ER prior to transport to the Golgi, or in the cis-Golgi after transport The removal of three mannose residues can be detected using gel electrophoresis because proteins modified in this way will...
Question 2 Not yet answered Marked out of 1,0 Flag question Question text Proteins destined for...
Question 2 Not yet answered Marked out of 1,0 Flag question Question text Proteins destined for the mitochondrial matrix must pass through the Select one: a. inner mitochondrial membrane b. intermembrane space c. outer mitochondrial membrane d. TOM complex e. All of these are correct. Question 3 Not yet answered Marked out of 1.0 Flag question Question text In nuclear transport: Select one: a. Nuclear pores allow proteins to freely move back and forth between the nucleus and cytoplasm. b....
Incorrect Question 3 0/2 pts Cell membranes act as selective barriers. Which of the following is...
Incorrect Question 3 0/2 pts Cell membranes act as selective barriers. Which of the following is best at crossing a pure lipid bilayer? amino acid such as tyrosine a sodium ion a gas such as oxygen an antibody a glucose molecule Incorrect 0/2 pts Question 5 A peripheral membrane protein is: is found outside the organism designates a protein that is in the plasma membrane versus mitochondrial membrane is only found in the blood may be associated with the membrane...
Please answer all questions 2 After isolating the rough endoplasmic reticulum from the rest of the...
Please answer all questions
2 After isolating the rough endoplasmic reticulum from the rest of the cytoplasm, you purify the RNAS attached to it. Which of the following proteins do you expect the RNA from the rough endoplasmic reticulum to encode? (a) (c) soluble secreted proteins plasma membrane proteins ER membrane proteins all of the above (b) (d) -13 In which cellular location would you expect to find ribosomes translating MRNAS that encode ribosomal proteins? (a) (c) the nucleus in...
LIPID AND MEMBRANE QUESTIONS 1. If an unsaturated fatty acid has 18 carbons, a double bond...
LIPID AND MEMBRANE QUESTIONS 1. If an unsaturated fatty acid has 18 carbons, a double bond at position would be in notation - 2. The functional groups which hold fatty acid molecules and glycerol molecules together in triacylglecerol molecules are called: 3. If a triacylglycerol is heated in aqueous sodium hydroxide (lye) solution glycerol and the sodium salts of fatty acids are produced. This mixture of sodium salts of fatty acids is called in common terminology 4. Name the four...
Please answer letter B!
1. (1.5 pts) Entering the ER: Translocation of proteins across the membrane of the ER is usually studied using microsomes (vesicles made from rough endoplasmic reticulum. Microsomes of the rough ER carry ribosomes attached to their outer surface. Translocation of proteins across the microsomal membrane can be assessed by several experimental criteria: (1) the newly synthesized protein is protected from added proteases, but not when detergents are present to solubilize the protecting lipid bilayer; (2) the...
4. Create some drawings/models of membrane transport proteins. Blob models are fine but they should be annotated as instructed below. In your drawing include a model for a lipid bilayer clearly showing the polar and non-polar nature of the lipid components. The models of the proteins should include annotation/shading or other indication that indicates the types of amino acid functional groups you might expect to see in (a) the exterior of the protein in contact with the lipid bilayer, (b)...
Which of the following statements describing the import of proteins into the nucleus is correct? Answers A-D A Transport into the nucleus requires the activity of a G protein. B The receptor for nuclear proteins is found in the cytosol and travels into the nucleus with the protein being transported o ะก Proteins destined for the nucleus are transported in a fully-folded conformation. D These statements are all correct. o You are interested in a water-soluble protein that functions within...
Question 24 Which of the following categories of membrane proteins is most likely to have restricted lateral mobility in a membrane? enzyme transporter O anchor O receptor all are restricted Question 5 New membrane synthesis occurs by spontaneous aggregation of free phospholipids into a new bilayer incorporation of phospholipids into one face of a preexisting membrane and their specific redistribution by enzymes like flippases incorporation of phospholipids into both faces of a preexisting membrane at the same time formation of...
When a protein is co-translationally translocated into the ER it sometimes receives attachments of eight mannose residues, which are added to a core carbohydrate unit consisting of GlcNAc (N-acetylglucosamine). The mannose residues are trimmed down from a unit of eight to a unit of five either in the ER prior to transport to the Golgi, or in the cis-Golgi after transport The removal of three mannose residues can be detected using gel electrophoresis because proteins modified in this way will...
Question 2 Not yet answered Marked out of 1,0 Flag question Question text Proteins destined for the mitochondrial matrix must pass through the Select one: a. inner mitochondrial membrane b. intermembrane space c. outer mitochondrial membrane d. TOM complex e. All of these are correct. Question 3 Not yet answered Marked out of 1.0 Flag question Question text In nuclear transport: Select one: a. Nuclear pores allow proteins to freely move back and forth between the nucleus and cytoplasm. b....
Incorrect Question 3 0/2 pts Cell membranes act as selective barriers. Which of the following is best at crossing a pure lipid bilayer? amino acid such as tyrosine a sodium ion a gas such as oxygen an antibody a glucose molecule Incorrect 0/2 pts Question 5 A peripheral membrane protein is: is found outside the organism designates a protein that is in the plasma membrane versus mitochondrial membrane is only found in the blood may be associated with the membrane...
Please answer all questions
2 After isolating the rough endoplasmic reticulum from the rest of the cytoplasm, you purify the RNAS attached to it. Which of the following proteins do you expect the RNA from the rough endoplasmic reticulum to encode? (a) (c) soluble secreted proteins plasma membrane proteins ER membrane proteins all of the above (b) (d) -13 In which cellular location would you expect to find ribosomes translating MRNAS that encode ribosomal proteins? (a) (c) the nucleus in...
LIPID AND MEMBRANE QUESTIONS 1. If an unsaturated fatty acid has 18 carbons, a double bond at position would be in notation - 2. The functional groups which hold fatty acid molecules and glycerol molecules together in triacylglecerol molecules are called: 3. If a triacylglycerol is heated in aqueous sodium hydroxide (lye) solution glycerol and the sodium salts of fatty acids are produced. This mixture of sodium salts of fatty acids is called in common terminology 4. Name the four...
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