"All the glycoproteins and glycolipids in intracellular membranes have oligosaccharide chains facing the luminal side, and all those in the plasma membrane have oligosaccharide chains facing the outside of the cell" is true or false.
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"All the glycoproteins and glycolipids in intracellular membranes have oligosaccharide chains facing the luminal side, and all those in the plasma membrane have oligosaccharide chains facing the outside of the cell" is true or false.
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- Glycoproteins contain oligosaccharide chains covalently bonded to a polypeptide while proteoglycans have one or more glycosaminoglycan chains attached to the protein. True FalseWhich of the following statements about glycosylation is true? the oligosaccharide on a protein leaving the ER usually is the same as an oligosaccharide transferred to that protein from dolichol the oligosaccharide transferred from dolichol is composed only of mannose glycosylation can occurs before the protein has finished its entry into the endoplasmic reticulum O cytosolic proteins are never glycosylatedIs the following statement true or false? "Proteasomes are involved with various cell processes. They break down excess or worn-out cell parts. They may be used to destroy invading viruses and bacteria by enveloping them in a lipid membrane structure."
- Glycolipids are synthesized in golgi where they remain on the lumenal half of the lipid bilayer. true falseWhy do glycolipids exist almost exclusively on the exterior side, but not on the cytoplasmic side of the cell membrane? Flippase move the glycolipids to this side of the membrane. The inner layer of the membrane is not thick enough to accommodate carbohydrates. Carbohydrates are only added to lipids on the lumen side of the ER and Golgi membranes. Carbohydrates are removed from the cytoplasmic side by glycosylase enzymes. NextWhich of the following statements are acceptable and why? [Whereas all the carbohydrate in the plasma membrane faces outward on the external surface of the cell, all the carbohydrate on internal membranes faces toward the cytosol.] [Although lipid molecules are free to diffuse in the plane of the bilayer, they cannot flip-flop across the bilayer unless enzyme catalysts called phospholipid translocators are present in the membrane.]
- Compare and contrast proteoglycans, glycoproteins, and glycosaminoglycans. Cite examples for eachWhich of the following fatty acids, if incorporated into a typical eukaryotic membrane phospholipid, would be the most likely to decrease that membrane’s fluidity? linolenic acid, with 18 carbons and three carbon-to-carbon double bonds linoleic acid, with 18 carbons and two carbon-to-carbon double bonds stearic acid, with 18 carbons and no carbon-to-carbon double bonds oleic acid, with 18 carbons and one carbon-to-carbon double bond all of the above molecules are saturated, and equally likely to decrease membrane fluidityWhich statement about the glycoprotein shown below is true? OH CH₂OH OH HN HN-C =0 CH3 H₂ Protein CH N-H Protein It contains a deoxyribose sugar that could be metabolized by human enzymes. O The monosaccharide is attached to the protein via nitrogen in a residue's a-amine. It contains a ribose sugar that could not be metabolized by human enzymes. The monosaccharide is attached to the protein via nitrogen in a residue's side chain.
- From these sentences answer YES or NO, 1. Are ALL ketoses are optically active?2. Is lactose a reducing sugar?3. Does glycogen have a higher degree of branching than amylose?4. Is lactose a disaccharide made up of two units?5. Is D-ribose a component of RNA?Casein is a protein found in milk. The role of casein in milk is to be a source of amino acids. Casein is therefore a amino acid storage molecule. Which carbohydrate molecule has an analogous role to that of casein? cellulose glycosylphosphatidyl inositol hyaluronic acid glycogernWhich of the following fatty acids, if incorporated into a typical eukaryotic membrane phospholipid, would be the most likely to increase that membrane’s fluidity? linolenic acid, with 18 carbons and three carbon-to-carbon double bonds linoleic acid, with 18 carbons and two carbon-to-carbon double bonds oleic acid, with 18 carbons and one carbon-to-carbon double bond stearic acid, with 18 carbons and no carbon-to-carbon double bonds all of the above molecules are unsaturated, and equally likely to increase membrane fluidity