1. Identify the following amino acid (at pH-7.0): (COO-)-CH(NH)CHrCH2CH2CHANH\')
ID: 148146 • Letter: 1
Question
1. Identify the following amino acid (at pH-7.0): (COO-)-CH(NH)CHrCH2CH2CHANH') A. glutamic acid B. glutamine C. aspartic acid D. lysine E. asparagine 2. Describe the amino acid illustrated above (at pH 7.0). A. it is a polar, negatively-charged amino acicd B. it is a non-polar, negatively-charged amino acid C. it is a polar, positively-charged amino acid D. it is a non-polar, positively-charged amino acid E. it is a non-polar, uncharged amino acid 3. How many chiral carbons are present in the above amino acid (aqueous form)? zero chiral carbons B. one chiral carborn C. two chiral carbons D. three chiral carbons E. four chiral carbons 4. How many optical isomers (stereoisomers) are possible for the above A. 2 32 optical isomers B. 2 16 optical isomers C. 2 -8 optical isomers D. 2-4 optical isomers E. 2" 2 optical isomers amino acid 5. The naturally-occurring amino acid L-serine (NH2-CH(COOH)-CH2-OH, dry form) shares all of the following features with the naturally-occurring amino acid D-serine, except: A. the same three-dimensional arrangement of covalent bonds B. the same stoichiometry C. the same number of covalent bonds D. the exact same atoms E. the same number of atomsExplanation / Answer
1. D. Lysine.
2. C. It is a polar positively-charged amino acid.
3. B. One chiral carbon
4. E = 21 2 optical isomers
5. B. The same stoichiometry
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