Concept explainers
Interpretation:
The Fischer projection and line formula for L-threonine is to be drawn.
Concept Introduction:
The absolute configuration of a chirality center is its three dimensional spatial arrangement of the substituents attached to it.
When determining the configuration of a chiral center, the atoms or groups attached to it are first assigned priorities on the basis of their
If two atoms attached to the chiral center have the same atomic number, then they are compared on the basis of the atomic numbers of the atoms attached to them.
The molecule is oriented, such that the lowest ranked group points away from the observer.
If the remaining three groups in order of the decreasing priority trace a clockwise path, the configuration is R.
If the remaining three groups in order of the decreasing priority trace a counter clockwise path, the configuration is S.
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ORGANIC CHEMISTRY (LL)-W/ACCESS
- Answer the following questions about the amino acid whose Fischer projection formula is a. Is it a D-amino acid or an L-amino acid? b. Is it a nonpolar or polar amino acid? c. Is it an essential or nonessential amino acid? d. Is it a standard or nonstandard amino acid?arrow_forward22-91 Which amino acid does not rotate the plane of polarized light?arrow_forwardExcept for cysteine, only S amino acids occur in proteins. Several R amino acids are also found in nature, however. (R)-Serine is found in earthworms, and (R)-alanine is found in insect larvae. Draw Fischer projections of (R)-serine and (R)-alanine. Are these d or l amino acids?arrow_forward
- If an amino acid had the following side chain it would be identified as polar CH2 - OH A) True B) Falsearrow_forwardDraw Fischer projection formulas for the following amino acids. a. L-Serine b. D-Serine c. D-Alanine d. L-Leucinearrow_forwardAssign an R or S configuration to the chiral center in each amino acid. (a) l-Phenylalanine (b) l-Glutamic acid (c) l-Methioninearrow_forward
- Although only l-amino acids occur in proteins, d-amino acids are often a part of the metabolism of lower organisms. The antibiotic actinomycin D, for example, contains a unit of d-valine, and the antibiotic bacitracin A contains units of d-asparagine and d-glutamic acid. Draw Fischer projections and three-dimensional representations for these three d-amino acids.arrow_forward1.Draw Fischer projection formulas for the following amino acids. L-Serine D-Serine D-Alanine L-Leucine 2. Draw the structure of alanylglutamylglycyllysinearrow_forwardWhich is an essential amino acid for infants and children due to their rapid growth? Glutamine Arginine Proline Alaninearrow_forward
- Where can you find the acyl group in the structure? A. At the 1-amino position of the sugar B. At the 1-amino position of the streptamine C. At the 1-amino position of the 2-deoxystreptamine At the 3-amino position of streptamine D. At the 3-amino position of 2-deoxystreptamine E. At the OH-position of the amino sugararrow_forwardWith the exception of Glycine, all amino acids are chiral. Two amino acids have actually more than one chiral carbon: draw the structures of these amino acids at pH 7.0 and indicate the locations of the chiral centers in each of these structures.arrow_forwardDraw the form in which glutamate exists at pH=0arrow_forward
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