Which of the following statements about secreted proteins is/are correct? Choose all that apply. Which of the following statements about secreted proteins is/are correct? Choose all that apply.
Secreted proteins travel directly from the rough endoplasmic reticulum into the trans face of the Golgi apparatus.
Secreted proteins are likely to have received N-linked glycosylation in the rough ER.
Secreted proteins are the only proteins that receive sugar modifications in the Golgi.
Secreted proteins that are constitutively expressed are exported as they are prepared, as opposed to being released as a response to a signal.
Secreted proteins are synthesized on membrane-bound ribosomes, not free cytosolic ribosomes.
Which of the following statements about secreted proteins is/are correct? Choose all that apply. Which of the following statements about secreted proteins is/are correct? Choose all that apply.
Secreted proteins travel directly from the rough endoplasmic reticulum into the trans face of the Golgi apparatus.
Secreted proteins are likely to have received N-linked glycosylation in the rough ER.
Secreted proteins are the only proteins that receive sugar modifications in the Golgi.
Secreted proteins that are constitutively expressed are exported as they are prepared, as opposed to being released as a response to a signal.
Secreted proteins are synthesized on membrane-bound ribosomes, not free cytosolic ribosomes.
Related textbook solutions
Related questions
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 |
QUESTION 30
The function of centrosome is:
| 1. | Microtubule initiation and organization in animal cells | |
| 2. | Organization of thin filaments | |
| 3. | Depolymerization of microtubules | |
| 4. | Organization of intermediate filaments |
2.5 points
QUESTION 31
The destinations of proteins synthesized on "free" ribomsomes include:
| 1. | Endoplasmic reticulum | |
| 2. | Nucleus | |
| 3. | Mitochondria | |
| 4. | Lysosomes |
2.5 points
QUESTION 32
Microtubules can be assembled and disassembled quickly in response to the cellular changes is because:
| 1. | Cells synthesize tubulin proteins very fast. | |
| 2. | Cells can turn other cytoskeletal filaments into microtubules | |
| 3. | Microtubules have an instable plus end and microtubules are probably organized by weak non-covalent interactions | |
| 4. | The motor proteins of microtubules can organize the microtubules in response to the cellular changes |
2.5 points
QUESTION 33
Both signal recognition particle and a translocon in rough endoplasmic reticulum membrane can recognize and bind to the signal sequence of a secretory protein, so they play the exact same role during protein co-translational translocation.
True
False
2.5 points
QUESTION 34
Rough endoplasmic reticulum is so named is because:
| 1. | It has many proteins associated with its surface. | |
| 2. | It has ribosomes associated with its cytosolic surface. | |
| 3. | It is associated with nuclear membrane. | |
| 4. | It has vesicles budding off its surface. |
2.5 points
QUESTION 35
The membrane vesicles that transport materials between membrane compartments have a protein coat. The protein coat has similar functions in different vesicles. These functions include:
| 1. | Help the enclosed material fold correctly. | |
| 2. | Help degrade the protein in the vesicles | |
| 3. | Maintain the internal pH of the vesicles | |
| 4. | Function as mechanical device to form a vesicle and select the components to be carried by a vesicle. |
2.5 points
QUESTION 36
Lysosomes are important for:
| 1. | Receptor-mediated endocytosis. | |
| 2. | Breaking down foreign particles brought into the cells by endosomes | |
| 3. | Regulating the process of organelle turnover. | |
| 4. | Protein trafficking between membrane compartments |
2.5 points
QUESTION 37
Which of the following is correct about membrane biosynthesis?
| 1. | Membranes are synthesized in Golgi Complex. | |
| 2. | Membranes arise from preexisting endoplasmic reticulum membranes. | |
| 3. | Membranes are synthesized on ribosomes. | |
| 4. | Membranes of all organelles have the same composition of proteins and lipids, since they all originate from endoplasmic reticulum. |
2.5 points
QUESTION 38
During skeletal muscle contractions, the shortening of the muscle fibers is because of:
| The shortening of the thin and thick myofilaments. | ||
| The shortening of the cytoskeletal filaments. | ||
| The kinesin proteins moving over microtubules. | ||
| The actin and myosin filaments sliding over each other. |
2.5 points
QUESTION 39
The assembly and disassembly of microtubules is regulated by rate of growth and shrinkage of the plus end.
True
False
2.5 points
QUESTION 40
The functions of Golgi complex include:
| 1. | O-linked oligosaccharides and most of a cellâs complex polysaccharides are assembled in Golgi complex | |
| 2. | Cis Golgi complex sorts proteins | |
| 3. | Trans Golgi complex segregates proteins in different types of vesicles for dilevery. | |
| 4. | N-linked oligosaccharides are further processed in Golgi complex |
