anat question

[incisorgirl]

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procollagen is formed at which level
-ER
-GOLGI

decks says ER and in kaplan its GOLGI

 

[foreigndentist]

is formed at ER level esp. RER

 

[asdf84]

ans is golgi.

 

[foreigndentist]

1. Three peptide chains are formed (2 alpha-1 and 1 alpha-2 chain) in ribosomes along the Rough Endoplasmic Reticulum (RER). These peptide chains (known as preprocollagen) have registration peptides on each end; and a signal peptide is also attached to each
2. Peptide chains are sent into the lumen of the RER
3. Signal Peptides are cleaved inside the RER and the chains are now known as procollagen
4. Hydroxylation of lysine and proline amino acids occurs inside the lumen. This process is dependent on Ascorbic Acid (Vitamin C) as a cofactor
5. Glycosylation of specific hydroxylated amino acid occurs
6. Triple helical structure is formed inside the RER
7. Procollagen is shipped to the golgi apparatus, where it is packaged and secreted by exocytosis

 

[incisorgirl]

thank u so much
one more question
in salivary glands,secretory granules are exocytosed from the apical cytoplasm,under
-sympathetic influence
-parasympathetic influence

1. Three peptide chains are formed (2 alpha-1 and 1 alpha-2 chain) in ribosomes along the Rough Endoplasmic Reticulum (RER). These peptide chains (known as preprocollagen) have registration peptides on each end; and a signal peptide is also attached to each
2. Peptide chains are sent into the lumen of the RER
3. Signal Peptides are cleaved inside the RER and the chains are now known as procollagen
4. Hydroxylation of lysine and proline amino acids occurs inside the lumen. This process is dependent on Ascorbic Acid (Vitamin C) as a cofactor
5. Glycosylation of specific hydroxylated amino acid occurs
6. Triple helical structure is formed inside the RER
7. Procollagen is shipped to the
   
   
   
   
   
   
   
   
   
   
   
   thank u so much
   one more question
   in salivary glands,secretory granules are exocytosed from the apical cytoplasm,under
   -sympathetic influence
   -parasympathetic influence
   
   
   
   
   
   
   
   
   golgi apparatus, where it is packaged and secreted by exocytosis

 

[aphistis]

thank u so much
one more question
in salivary glands,secretory granules are exocytosed from the apical cytoplasm,under
-sympathetic influence
-parasympathetic influence

Salivation is parasympathetically mediated.

 

[incisorgirl]

in salivary glands
lining of intercalated duct--simple cuboidal or simple columnar
and of excretory duct is-stratified columnar or stratified squamous

apical cytoplasm of secretory end piece(in sal. glands) has abundant
-mitochondria
-RER
-GOLGI

in cell membranes,location of choline and amine containig phospholipids ?

 

[drli]

in cell membranes,location of choline and amine containig phospholipids ?[/quote]

choline containig phospholipids are enriched in outer leaflet of the lipid bilayer


amine containig phospholipids are found mainly in inner leaflet