BMSC-200 Usask Exam Questions and
Answers
Which statement(s) about pH is FALSE? - ANSWER--A 100-fold increase in [H+]
reflects a decrease of 2 pH units.
-In water, the product of [H+][OH-] always equals a constant number
- In aqueous solutions, [H+] is always equal to 10-7 M.
Molecules with both polar and non-polar groups are called - ANSWER-Amphipathic
Elements of secondary structure: - ANSWER--have phi and psi angles within the
allowed regions of a Ramachandran plot.
-optimize main-chain hydrogen bonding potential
-have conserved structural features independent of the specific protein in which they
are contained.
-include alpha helicies and beta sheets.
Which of these residues is most likely to be found at the C-terminus of an alpha
helix? - ANSWER-Arg
Within the main chain of a polypeptide: - ANSWER--rotations between the alpha
carbon to the amide nitrogen and carbonyl carbon are described by phi and psi
respectively.
-there is a repeating pattern of NCCNCC
-sequential residues are linked by covalent bonds.
-conformational flexibility is limited to rotation at the alpha carbons.
The final folding pattern of a single polypeptide chain represents: - ANSWER-
Tertiary structure
Which of these functional groups is ABSENT from the peptide SKCH? - ANSWER-
guanidino
Peptide bonds: - ANSWER-are rigid and planar with a partial double bond
characteristic.
- are usually trans with respect to their carbonyl and amide groups.
- can donate and accept hydrogen bonds.
-are covalent linkages between residues of proteins.
Which functional groups are involved in the formation of a peptide bond? -
ANSWER-Carboxyl and amino
The amino acid residues of a polypeptide chain are linked together through: -
ANSWER-peptide bonds
Answers
Which statement(s) about pH is FALSE? - ANSWER--A 100-fold increase in [H+]
reflects a decrease of 2 pH units.
-In water, the product of [H+][OH-] always equals a constant number
- In aqueous solutions, [H+] is always equal to 10-7 M.
Molecules with both polar and non-polar groups are called - ANSWER-Amphipathic
Elements of secondary structure: - ANSWER--have phi and psi angles within the
allowed regions of a Ramachandran plot.
-optimize main-chain hydrogen bonding potential
-have conserved structural features independent of the specific protein in which they
are contained.
-include alpha helicies and beta sheets.
Which of these residues is most likely to be found at the C-terminus of an alpha
helix? - ANSWER-Arg
Within the main chain of a polypeptide: - ANSWER--rotations between the alpha
carbon to the amide nitrogen and carbonyl carbon are described by phi and psi
respectively.
-there is a repeating pattern of NCCNCC
-sequential residues are linked by covalent bonds.
-conformational flexibility is limited to rotation at the alpha carbons.
The final folding pattern of a single polypeptide chain represents: - ANSWER-
Tertiary structure
Which of these functional groups is ABSENT from the peptide SKCH? - ANSWER-
guanidino
Peptide bonds: - ANSWER-are rigid and planar with a partial double bond
characteristic.
- are usually trans with respect to their carbonyl and amide groups.
- can donate and accept hydrogen bonds.
-are covalent linkages between residues of proteins.
Which functional groups are involved in the formation of a peptide bond? -
ANSWER-Carboxyl and amino
The amino acid residues of a polypeptide chain are linked together through: -
ANSWER-peptide bonds
