Lehninger Principles of Biochemistry- Chapter 3 Key Terms Exam Bank Solution Manual Already Passed
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Lehninger Principles of Biochemistry- Chapter 3
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Lehninger Principles Of Biochemistry- Chapter 3
Lehninger Principles of Biochemistry- Chapter 3 Key Terms Exam Bank Solution Manual Already Passed
amino acids - Answers α-Amino-substituted carboxylic acids, the building blocks of proteins.
residue - Answers A single unit in a polymer; for example, an amino acid in a polypeptide chain. The te...
Lehninger Principles of Biochemistry- Chapter 3 Key Terms Exam Bank Solution Manual Already
Passed
amino acids - Answers α-Amino-substituted carboxylic acids, the building blocks of proteins.
residue - Answers A single unit in a polymer; for example, an amino acid in a polypeptide chain. The
term reflects the fact that sugars, nucleotides, and amino acids lose a few atoms (generally the elements
of water) when incorporated in their respective polymers.
R group - Answers (1) Formally, an abbreviation denoting any alkyl group. (2) Occasionally, used in a
more general sense to denote virtually any organic substituent (e.g., the R groups of amino acids).
chiral center - Answers An atom with substituents arranged so that the molecule is not superposable on
its mirror image.
enantiomers - Answers Stereoisomers that are nonsuperposable mirror images of each other.
absolute configuration - Answers The configuration of four different substituent groups around an
asymmetric carbon atom, in relation to ᴅ- and ʟ-glyceraldehyde.
ᴅ, ʟ system - Answers Make sure that the molecule is drawn as the Fischer projection in which the
carboxylic acid group is on top and the side chain on bottom. If the amine group is on the right of the
carbon chain, assign the label ᴅ to the compound; if it is on the left of the carbon chain, assign the label
ʟ.
polarity - Answers (1) In chemistry, the nonuniform distribution of electrons in a molecule; polar
molecules are usually soluble in water. (2) In molecular biology, the distinction between the 5' and 3'
ends of nucleic acids.
absorbance, A - Answers A measure of the capacity of a substance to absorb light of a specified
wavelength. It is equal to the logarithm of the reciprocal of the transmittance.
zwitterion - Answers A dipolar ion with spatially separated positive and negative charges.
isoelectric pH (isoelectric point, pI) - Answers The pH at which a solute has no net electric charge and
thus does not move in an electric field.
peptide - Answers Two or more amino acids covalently joined by peptide bonds.
protein - Answers A macromolecule composed of one or more polypeptide chains, each with a
characteristic sequence of amino acids linked by peptide bonds.
peptide bond - Answers A substituted amide linkage between the α-amino group of one amino acid and
the α-carboxyl group of another, with elimination of the elements of water.
oligopeptide - Answers A short polymer of amino acids joined by peptide bonds.
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