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Week 2: Amino acids & peptides
Terms in this set (23)
Consider the peptides
Ser - Glu - Gly - His - Ala
Gly - His - Ala - Glu - Ser
If the amino acids in peptides and proteins contained no sulphur, there would be more possible tertiary conformations. T/F
D- amino acids differ from L-amino acids due to differences around which atom?
Peptides that contain D-amino acids are found in bacterial cell walls and in some antibiotics. T/F
Identify the polar amino acids in the following amino acid sequence
Val - Met - Ser - Ile - Phe - Arg - Cys - Tyr - Leu
Ser, Arg, Cys, Tyr
Are amino acids other than the usual 20 amino acids found in proteins? Y/N
Amino acid with R group feature
planar, can be written as a resonance hybrid, basis of protein structure
Which amino acid would migrate furthest toward the anode (positive electrode) during electrophoresis?
Which amino acid would have the greatest negative charge at pH = 7.0?
Which amino acid takes on a positive charge when the R group gains a proton?
Which is a correct pair of abbreviations for an amino acid?
Asn / N
Which of the following is a cyclic amino acid?
Which of the following properties are determined by the R group of an amino acid?
All of the properties in the above options are determined by the R group of an amino acid.
Which of the following options is correct with respect to the amino acid composition of proteins?
Proteins with different functions usually differ significantly in their amino acid composition.
The amino acid sequence determines the three-dimensional structure of the protein
Choose the correct answers for the following statement:
Amino acids share communal features, such as
an amino group, which is normally protonated and is responsible for the basic properties of amino acids
being zwitterions, as they may contain positive and negative charges.
Choose the correct statements about the peptide
It has 4 peptide bonds
Its sequence can be written as SGYAL
A hydrogen atom with a slight positive charge is attracted to a negative charge of another molecule or atom
Two atoms share electrons so they can fill their outer shells
Van der Waals interactions
The constant motion of electrons and the creation of charge imbalances can bond
two molecules/groups together.
One atom loses one or more electrons and the other atom gains one or more electrons.
What is the main reason for atoms to form ions?
To fill their outer electron shells
Which of the following has the weakest bond strength?
Sets with similar terms
BioChem Chapter 3
Chapter 3 (Amino Acids)
MCAT: Biologically Important Molecules
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