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1) Where are proteins in the mitochondrion synthesized?

(a)in the cytosol

(b)in the mitochodrion

(c)on the endoplasmic reticulum

(d)in both the cytosol and the mitochondrion

2) Select the incorrect association between thecomponents involved with ER transport with the appropriate cellularlocation.

(a)SRP receptor/ ER membrane

(b)active site of signal peptidase/ cytosol

(c)Protein translocator / ER membrane

(d)signal-recognition particle/ cytosol

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5 May 2019
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Related questions

28 Which of the following statement is false?

(a) Not all peroxisomal proteins are synthesized on the ER.

(b) Enzyme that transfers sugar chain from lipid to transmembrane protein on ER is expected to have ER retention signals.

(c) Signal recognition particle (SRP) for ER signal sequence is in cytosol.

(d) SRP receptor is located at ER membrane and its SRP binding site faced to ER lumen.

29 Most proteins destined to enter the endoplasmic reticulum _________.

(a) are transported across the membrane after their synthesis is complete.

(b) are synthesized on free ribosomes in the cytosol.

(c) begin to cross the membrane while still being synthesized.

(d) are keep binding to Signal recognition particle (SRP) while they are translated.

30 Which of the following choices reflects the appropriate order of locations through which a protein destined for the plasma membrane travels?

(a) lysosome → endosome → plasma membrane

(b) ER → lysosome → plasma membrane

(c) Golgi → lysosome → plasma membrane

(d) ER → Golgi → plasma membrane

31 Which of the following statements about vesicle budding from the Golgi is false?

(a) COPII can initiate vesicle budding on Golgi membrane.

(b) Some vesicles budded from Golgi membranes move towards ER.

(c) Once vesicle budding completed, clathrin molecules are released from the vesicle.

(d) Clathrin molecules act at the cytosolic surface of the Golgi membrane.

32 Which of the following statements is false?

(a) The signal sequences on mitochondrial proteins are first bound to translocator on outer membrane after translation.

(b) Most mitochondrial proteins are not imported from the cytosol but are synthesized inside the mitochondria.

(c) Chaperone proteins in the mitochondria facilitate the movement of proteins across the outer and inner mitochondrial membranes.

(d) Mitochondrial proteins cross the membrane in their unfolded state.

please help me answer theses questions correctly

1/ Which of the following are required for one-pass transmembrane proteins?

I. N-terminal signal sequence

II. Binding of SRP to the SRP receptor

III. Presence of stop-transfer sequence

IV. Presence of start-transfer sequence

a) I and III

b) I, II, and III

c) II, III, and IV

d) I, II, III, and IV

___________________

2/ Which of the following statements about the signal-recognition particle (SRP) is FALSE?

a) The SRP binds to the ER signaling sequence after the entire protein has been translated by the ribosome.

b) The SRP cycles between the ER membrane and the cytosol.

c) The SRP is required for peptides destined for either the ER membrane or ER lumen.

d) The SRP recognizes the signal sequence at the N-terminus of the newly forming polypeptide.

______________________

3) t-SNARES are _____.

a) found on the cytosolic side of the vesicle membrane.

b) necessary for recognition and transport of proteins into the nucleus.

c) usually located on the target membrane.

d) necessary for vesicle formation.

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