BIOB10H3 Chapter Notes - Chapter 257-260, 265-267: Photographic Emulsion, Secretion, Endomembrane System

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amethystfly177

29 Sep 2016

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Endomembrane system is composed of endoplasmic reticulum, golgi complex, lysosome, endosome, and vacuoles. Each individual organelle function in the cell so it can work uniformly. Materials in the cell travel around in a transport vesicle bud from the er to the golgi, for example. The biosynthetic pathway is the normal pathway in which materials from the er travel to the. Golgi complex to lysosome or vacuole in plant cell out to the plasma membrane. It is known as the normal expected pathway because many of the protein synthesized travel in the manner discussed above getting discharged from the cell and out to the plasma membrane (secreted, exocytose). During constitutive secretion (continuous manner) materials are synthesized in the vesicles that takes it and releases it outside of the cell where it forms the extracellular and plasma membrane. Most cell go through this process of secretion.

Related Questions

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.

(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 â endosome â plasma membrane

(b) ER â lysosome â plasma membrane

(d) ER â Golgi â 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.

(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.

orangeplatypus673

1A. Which of the following statements about the endomembrane system is/are correct? (select all that apply)

A.	Secreted proteins are inserted into the ER as they are being made by ribosomes.
B.	the nucleus is surrounded by two phospholipid bilayers.
C.	"Free" ribosomes attach to the endoplasmic reticulum.
D.	Secreted proteins are moved from the ER to the Golgi by ribosomes

1B. Place these components of the endomembrane system into the correct order in respect to when they first function in the production of a secreted protein.

	Endoplasmic Recticulum (ER)
	Riibosome
	Nucleus
	Transport Vesicle
	Cell Membrane
	Golgi Apparatus

lilacgnat89

1. The histones that form the core of the nucleosome get into the nucleus by which of the following?

a) Passive diffusion through nuclear pores

b) Selective and facilitated active transport through nuclear pores

c) Ribosomes located in the nucleus synthetize histones in the nucleus

d) Histones are made at the ER membrane and then diffuse to the nucleus

2. Membrane proteins that belong to the golgi, lysosome, or plasma membrane first pass through which organelle before reaching their final subcellular destination?

a) The golgi apparatus

b) The smooth ER

c) The nucleus

d) The ER membrane

e) The ER lumen

3. Where in the cell would a ribosomal protein be located if it has had its nuclear export signal inactivated (non-functional or non-existent).

a) The protein would be found in the ER lumen

b) The protein would remain in the nucleus

c) The protein would be secreted

d) The protein would remain in the cytoplasm

e) The protein would be in the ER membrane

4. Where would be the final destination of a protein if it contained a NLS anywhere in the protein sequence (and which is exposed to the cytoplasm after protein folding) but also contained an ER signal sequence at the carboxy terminus?

a) The ER lumen

b) The nucleus

c) The cytoplasm

d) The inner nuclear membrane

e) The ER membrane

5. The sequence K-D-E-L serves as a retention/retrieval signal for ER proteins.

a) True

b) False

6. The following are true for both cell membrane proteins and secretory proteins EXCEPT?

a) Precursors of the mature proteins contain signal sequence.

b) Both types of proteins contain stop-transfer sequences

c) Both types of proteins enter the ER while being synthetized

d) Both types of proteins pas through the golgi apparatus

e) Both are carried by clatherin-coated vesicles

7. If you isolate a regulated secreted protein from a secretory/storage vesicle and inject it into the cytosol, is will?

a) Be secreted through channels in the plasma membrane

b) Be taken up into secretory vesicle and secreted

c) Remain in the cytosol until it is degraded

d) Be taken up into the rough ER and follow the secretory pathway

goldmanatee250

BIOB10H3 Chapter Notes - Chapter 257-260, 265-267: Photographic Emulsion, Secretion, Endomembrane System

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