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Concept explainers
(a)
Interpretation: The number of carboxyl groups and amino groups present in polar neutral amino acids has to be stated.
Concept introduction: Amino acid is a compound that is composed of
(b)
Interpretation: The number of carboxyl groups and amino groups present in polar acidic amino acids has to be stated.
Concept introduction: Amino acid is a compound that is composed of
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Chapter 20 Solutions
EBK GENERAL, ORGANIC, AND BIOLOGICAL CH
- Which of the following statements is true about amino acids? a. All twenty (20) of these protein-derived amino acids are a-amino acids, meaning that the amino group is located on the carbon alpha to the carboxyl group. b. For nineteen (19) of the twenty (20) amino acids, the a-amino group is primary. Glycine is different; its a-amino group is secondary. c. With the exception of proline, the a-carbon of each amino acid is a chiral center. As shown in Table 27.1, all 19 chiral amino acids have the same relative d. Both a & carrow_forwardConstruct the two enantiomeric forms/structure of the following monosaccharides and designate the handedness of each using D, L system: a. Ribulosearrow_forwardName four major groups of amino acids, categorizedby the properties of their R groups. Explain how thechemical properties of each group affect protein shape.arrow_forward
- An amino acids unique property arises through which component? How does this same component contribute to the overall chemical nature of the protein?arrow_forwardThe common amino acids are polyprotic acids. All amino acids contain an amino group and a carboxyl group. Some amino acids contain ionizable side chains. The presence of an ionizable side chain creates a third ionizable group. For a diprotic amino acid such as glycine (structure shown below), three forms are possible. These forms, the fully protonated (AA*), single deprotonated (AA°), and completely deprotonated (AA) exhibit different acid-base properties. NH;+ NH,+ NH, Neutral H,A (AA+) A- (AA•) (AA-) The Ka describing the AA* and the AA° equilibrium is 4.57 x10-3, while the Ka involving AA° and the anionic form AA- is a much smaller 2.51 x 10-10, The neutral form, AA° is referred to as isoelectric glycine. All amino acids can assume the isoelectric form under proper conditions. a. Calculate the pH of a 0.1 M solution prepared from the salt glycine hydrochloride (hint: use ICE table).arrow_forwardMany bioactive compounds are derived from amino acids. This compound, found in trace amounts in mammalian brains and hypothesized to play a role as a neuromodulator or neurotransmitter, is derived from an amino acid through removal of the backbone carboxylic acid group. The amino acid from which it is derived must be: (Write out the entire name; Spelling matters, but case does not; Do not include L- or D- in the name; For acidic amino acids write the full name, e.g. “so-and-so acid”)arrow_forward
- Amino acids are classified according to the R group linked at the carboxyl group.a. Trueb. Falsearrow_forwardWhich amino acid is technically not an amino acid? Whichamino acid contains no chiral carbon atoms?arrow_forwardWhat type of intermolecular forces mainly exist between the side chains of each of the following pairs of amino acids? Select the single best answer for each part below. Note: Reference the Naturally-occurring amino acids table for additional information. Part 1 of 3arrow_forward
- Define the following terms: a. eicosanoid b. omega-6 fatty acid c. omega-3 fatty acid d. trans fatty acid e. acyl grouparrow_forwardWhich functional group(s) shown above is (are) present in all amino acids?arrow_forwardAnswer the following questions: a. How many possible stereoisomers does D-ribose have? b. What bond is present between the fatty acyl group and the C-2 amino group of sphingosine in a Ceramide?arrow_forward
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