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Why dont the lipids and steroids leaving the smooth endoplasmic reticulum destined to be secreted from the cell need to be enclosed in a vessicle?
Wiki User
∙ 11y ago
Steroid and lipid are hydrophobic and are hence soluble in lipids. Their non-polar nature also allows them to simply diffuse past the cell plasma membrane's hydrophobic core. Thus, the vesicles are not required for transportation (exocytosis).
Wiki User
∙ 11y ago
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How are endoplasmic reticulum and ribosomes related?
some ER have ribosomes attached, if proteins need to be secreted out of the cell
Which organelle is a network of membranes involved in the production of proteins that will become secreted of part of the plasma membrane?
The rough endoplasmic reticulum is a network of membranes involved in the production of proteins. Protein synthesis occurs in the ribosomes, which are attached to the outside of the rough ER, giving it a 'rough' appearance.
Why do some cells of the human pancreas have up to 100 times the amount of endoplasmic reticulum as other parts of the body?
The pancreas secretes the hormones insulin, glucagon, and somatastatin, and the digestive enzymes, lipase, protease, and amylase. Proteins that will be secreted by the cell are produced by the ribosomes on the rough endoplasmic reticulum. Therefore, cells that secrete proteins have a large amount of rough endoplasmic reticulum.
What participates in lipid synthesis and synthesis of membrane or secreted proteins?
Lipid synthesis primarily involves enzymes located in the endoplasmic reticulum (ER). These enzymes include fatty acid synthase, which synthesizes fatty acids, and enzymes involved in glycerolipid and phospholipid synthesis. In addition, the synthesis of membrane or secreted proteins involves ribosomes attached to the ER, where these proteins are synthesized and processed before being transported to their target destinations.
Why do proteins that move to the nucleus tend not to contain an N-terminal signal peptide?
The N-terminal signal peptide is recognised by SRP (signal recognition particle). SRP directs the peptide to translocons on the membrane of the rough endoplasmic reticulum, usually during translation (co-translational). The translocon is responsible for the transport of the protein into the endoplasmic reticulum, from which it will either be secreted or sent to organelles such as the mitochondria, chloroplasts, endosome, lysomome and peroxisome. These organelles require that proteins go through the endoplasmic reticulum as the proteins are incorporated into the organelles through vesicular transport, as they do not have their own uptake methods. Proteins destined for the nucleus are not sent through the endoplasmic reticulum, as the method of transport into the nucleus is not vesicular. Instead, the nucleus has its own pores capable of translocating proteins into the nucleus. Small objects can pass through these nuclear pores by passive transport, but anything bigger than 40kDa requires a special mechanism. Proteins destined for the nucelus have a nuclear-localisation signal (NLS) instead of the N-terminal signal peptide. The NLS is a seven residue sequence of basic amino acids at the C-terminus.
What substances are secreted by rough endoplasmic reticulum?
proteins
What substances are secreted by a rough endoplasmic reticulum?
Only Protein
What are the two main functions of the rough endoplasmic reticulum?
The endoplasmic reticulum is an organelle that transports materials within a cell. It can be classified into two, namely: the rough endoplasmic reticulum which has ribosomes and the smooth endoplasmic reticulum which does not have ribosomes.
How are endoplasmic reticulum and ribosomes related?
some ER have ribosomes attached, if proteins need to be secreted out of the cell
Which organelle is a network of membranes involved in the production of proteins that will become secreted of part of the plasma membrane?
The rough endoplasmic reticulum is a network of membranes involved in the production of proteins. Protein synthesis occurs in the ribosomes, which are attached to the outside of the rough ER, giving it a 'rough' appearance.
What produces protein that will be secreted by the cell?
A hormone destined for secretion from the cell would be manufactured by ribosomes that are attached to the endoplasmic reticulum. The endomembrane system includes Golgi apparatus, lysosomes, vacuoles, and the endoplasmic reticulum.
Why do some cells of the human pancreas have up to 100 times the amount of endoplasmic reticulum as other parts of the body?
The pancreas secretes the hormones insulin, glucagon, and somatastatin, and the digestive enzymes, lipase, protease, and amylase. Proteins that will be secreted by the cell are produced by the ribosomes on the rough endoplasmic reticulum. Therefore, cells that secrete proteins have a large amount of rough endoplasmic reticulum.
Where are proteins made in the cell?
Depending on where the protein will end up, it will either be made by ribosomes in the cytoplasm (proteins that are to remain soluble in the cell) or ribosomes docked on the endoplasmic reticulum (proteins that will be secreted out of the cell, incorporated into the plasma membrane, proteins that will end up in the endoplasmic reticulum and/or Golgi complex).
Where are protein made in a cell?
In the Ribosomes.
What two organelles produce protein?
The two organelles that produce protein are the ribosomes and the rough endoplasmic reticulum. The ribosomes manufacture proteins for the cell through protein synthesis. The rough endoplasmic reticulum produces proteins here that are often secreted by the cell and carried by the vesicles to the Golgi apparatus.
How are ribosomes the endoplasmic reticulum and Golgi body related?
ribosomes recieve mRNA and are responsible for proteinsynthesis, located on the edndoplasmic reticulum which transports these proteins in vesicles. The golgi apparatus recieves this and modifies it to then be secreted out the cell via exocytosis. Hope this helps!
What participates in lipid synthesis and synthesis of membrane or secreted proteins?
Lipid synthesis primarily involves enzymes located in the endoplasmic reticulum (ER). These enzymes include fatty acid synthase, which synthesizes fatty acids, and enzymes involved in glycerolipid and phospholipid synthesis. In addition, the synthesis of membrane or secreted proteins involves ribosomes attached to the ER, where these proteins are synthesized and processed before being transported to their target destinations.
