Chemistry: An Atoms-Focused Approach
14th Edition
ISBN: 9780393912340
Author: Thomas R. Gilbert, Rein V. Kirss, Natalie Foster
Publisher: W. W. Norton & Company
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All amino acids share a common
structure, a central (alpha) carbon
with four groups attached. Which
of these is NOT one of the four
groups attached to the alpha-
carbon?
O an R group
an ammonium group (-NH3+)
O a carboxylate group (-COO)
a hydronium group
Consider the structure of the amino acid L-alanine.
Which functional groups are common to all amino acids?
H
COOH
NH₂
CH3
Which of the following is true about the twenty standard amino acids?
All of them are achiral molucules.
All of them have primary alpha-amino group.
O All of them are essential amino acids that can be synthesized by the body.
All of them are chiral molecules.
Chapter 19 Solutions
Chemistry: An Atoms-Focused Approach
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- 22-62 Distinguish between intermolecular and intramolecular hydrogen bonding between backbone groups. Where in protein structures do you find one, and where do you find the other?arrow_forwardWhat functional groups are found in all amino acids? How many different amino acids are found in naturally occurring proteins?arrow_forwardWhich of the following is/are true? Methionine is an essential amino acid Valine contains two chiral carbons Glycine is an achiral amino acid The alpha-amino group and the alpha-carboxyl group of an amino acid can be neutral at a particular pH.arrow_forward
- How many atoms of each element are in a molecule of the amino acid lysine C6H14N3O2 ?arrow_forwardwhat are biodegadable polymers ?arrow_forwardDraw the chemical structure of a polypeptide whose primary structure is Serine-Asparagine-Valine. Draw squares around the atoms in your structure that are involved in the bonds that hold secondary protein structure together.arrow_forward
- You are given the structures of the amino acids alanine (Ala), methionine (Met) and threonine (Thr). to H2N CO2H H2N CO2H H2N co,Harrow_forwardAs we’ve discussed, a peptide bond is made when amino group of one amino acid combines with the carboxylic acid group of another amino acid (releasing a water molecule in the process). The C-N bond formed in this process is called a peptide bond. Peptide bonds have a few properties that might be unexpected. a) One property is that the molecular geometries around the C and N atom in the peptide bond are generally planar with bond angles of approximately 120 degrees. Provide an explanation for why the peptide bond would have this property, using Lewis structures, VSEPR theory and/or valence bond theory as appropriate.arrow_forwardIf two amino acids are combined with a peptide bond, how would you describe the structure? 000 Dipeptide Protein Amide Polypeptide E vyarrow_forward
- Amino acids containing a nonpolar "R" group, such as an alkyl or aromatic, are in nature. acidic O hydrophobic O hydrophilic O basicarrow_forwardWhat is the structure of SeF5NF2?arrow_forwardSuppose a long-chain polypeptide is constructed entirely from phenylalanine monomer units. What is its empirical formula? How many amino acids does it contain if its molar mass is 17,500 g mol-1 ?arrow_forward
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