Compare the following tripeptides and determine their relationships: Gly-Cys-Ala
ID: 995038 • Letter: C
Question
Compare the following tripeptides and determine their relationships: Gly-Cys-Ala and Cys-Gly-Ala. Constitutional isomers the same compound different compounds none of the above Which of the following is the monomer for cellulose? Alpha-D-glucose beta-D-glucose chitin amylose None Which amino acid does not have a chirality center? Alanine cysteine proline serine glycinc Which amino acid can formdisulfide bridges? Alanine cysteine proline serine glycinc Which of the following is the monomer for chitin? Collagen DNA glycogen chitin all of the above Which of the following amino acid has a thiol gropu? Which of the following is a beta-D-glucose? None of the above Which one od followi is (are) synthetic polymers(s)? PET PVC Teflon Kevlar all of the above What is the polysaccharide that the human body uses to store energy? Collagen cellulose glycogen chitin glucoseExplanation / Answer
Dear Student,
1. Gly-cys-ala and Cys-gly-ala are the same compound.
2. Beta - D - Glucose is a monomer unit for cellulose.
3. The only amino acid that does not have a chiral center is glycine. Its structure is: H2NCH2COOH.
4. The only amino acid which can form disulfide bridges is cysteine.
Disulfide bonds in proteins are formed between the thiol groups of cysteine residues by the process of oxidative folding. The other sulfur-containing amino acid, methionine, cannot form disulfide bonds.
5. N-Acetylglucosamine is a monomer unit of Chitin.
Chitin (C8H13O5N)n is a long-chain polymer of a N-acetylglucosamine, a derivative of glucose (to be precise, 2-(acetylamino)-2-deoxy-D-glucose).
These units form covalent -1,4 linkages (similar to the linkages between glucose units forming cellulose).
Therefore, chitin may be described as cellulose with one hydroxyl group on each monomer substituted with an acetyl amine group.
This allows for increased hydrogen bonding between adjacent polymers, giving the chitin-polymer matrix increased strength.
Therefore option E = None of the above.
6. Natural polymers occur in nature and can be extracted. They are often water-based. Examples of naturally occurring polymers are silk, wool, DNA, cellulose and proteins.
Therefore option B = DNA.
7. The amino acid which has a thiol group is cysteine.
8. The Structure of beta D-Glucose is as follows,
Therefore, option is C.
9. Synthetic polymers are human-made polymers. From the utility point of view they can be classified into four main categories: thermoplastics, thermosets, elastomers and synthetic fibers. They are found commonly in a variety of consumer products such as money, super glue, etc.
The seven most common types of synthetic organic polymers are: low density polyethylene (LDPE), high density polyethylene (HDPE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylon, Teflon, and thermoplastic polyurethane (TPU).
Therefore, option C = Teflon.
10. In humans, glycogen is made and stored primarily in the cells of the liver and the muscles hydrated with three or four parts of water.
Glycogen functions as the secondary long-term energy storage, with the primary energy stores being fats held in adipose tissue.
Muscle glycogen is converted into glucose by muscle cells, and liver glycogen converts to glucose for use throughout the body including the central nervous system.
Therefore, option C = Glycogen is the polysaccharide that the human body uses to store energy.
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