Most proteins destined to enter the endoplasmic reticulum

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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?

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(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.

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

Answer

Answer:

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

30). (d) ER → Golgi → plasma membrane

Explanation:

The proteins move from ER to Golgi. The traveled from the Golgi
apparatus to the cell surface in secretory vesicles, which then
fused with the plasma membrane to release their contents outside of
the cell.

The secretory pathway: rough ER → Golgi → secretory vesicles →
cell exterior.

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

Explanation:

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Clathrin and clathrin adaptors are key molecules in the process
of clathrin-mediated endocytosis, which is used for the specific
uptake of large extracellular molecules such as proteins,
membrane-localized receptors, and ion channels.

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


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