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WGU C785 BIOCHEMISTRY UNIT EXAM QUESTIONS WITH 100% CORRECT ANSWERS 2026

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WGU C785 BIOCHEMISTRY UNIT EXAM QUESTIONS WITH 100% CORRECT ANSWERS 2026

Institution
WGU C785 BIOCHEMISTRY UNIT
Course
WGU C785 BIOCHEMISTRY UNIT

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WGU C785 BIOCHEMISTRY UNIT EXAM
QUESTIONS WITH 100% CORRECT ANSWERS
2026

Which level of protein structure is disrupted through the hydrolysis of peptide
y y y y y y y y y y y


bonds?
y




Quaternary


Tertiary


Primary


Secondary yyyyyy correct answers >> Primary
y y yyy




The primary structure of a protein is the sequence of amino acids held together by
y y y y y y y y y y y y y y


peptide bonds. Peptide bonds are formed by dehydration reactions and disrupted
y y y y y y y y y y y


by hydrolysis.
y y




A mutation in the beta-hemoglobin gene, which results in the replacement of the
y y y y y y y y y y y y


amino acid glutamate in position 6 with the amino acid valine, leads to the
y y y y y y y y y y y y y y


development of sickle cell anemia. The structures of glutamate and valine are
y y y y y y y y y y y y


shown below.
y y




If the beta hemoglobin gene in a patient with sickle-cell anemia were to be edited
y y y y y y y y y y y y y y


yso that the valine in position 6 was replaced with a different amino acid, which
y y y y y y y y y y y y y y

,replacement for valine would be expected to have the best clinical outcome, in
y y y y y y y y y y y y y


theory, for the patient? (Assume the valine can potentially be replaced with any
y y y y y y y y y y y y y


amino acid other than glutamate.) correct answers >> The original amino acid
y y y y y yyyyyy y y yyy y y y


in a healthy patient is glutamate, which is negatively charged. The mutated amino
y y y y y y y y y y y y y


acid is valine, which is non-polar. Valine is causing sickle cell anemia. The best
y y y y y y y y y y y y y y


amino acid to replace valine so that the patient is healthy again would be the one
y y y y y y y y y y y y y y y y


most like glutamate, so any negatively charged amino acid.
y y y y y y y y y




Secondary, tertiary, and quaternary levels of protein structure can all be impacted
y y y y y y y y y y y


by exposing a protein to which treatment?
y y y y y y y




Change of a hydrophobic amino acid to a different hydrophobic amino acid
y y y y y y y y y y y




Addition of a reducing agent y y y y




Placement of the protein in a solution with a low pH
y y y y y y y y y y




Increase in the concentration of the protein in solution
y y y y y y y y yyyyyy correct answers >> y y yy


yPlacement of the protein in a solution with a low pH
y y y y y y y y y y




Changes in pH affect hydrogen bonds and ionic bonds. Hydrogen bonds in the
y y y y y y y y y y y y


backbone of amino acids occur in secondary structure, and both hydrogen bonds
y y y y y y y y y y y y


and ionic bonds occur in the side chains of amino acids in tertiary structure.
y y y y y y y y y y y y y y




An increase in beta-pleated sheet structure in some brain proteins can lead to an
y y y y y y y y y y y y y


increase in amyloid deposit formation, characteristic of some neurodegenerative
y y y y y y y y y


diseases. What is the primary biochemical process that follows the increase in
y y y y y y y y y y y y


beta-pleated sheet structure that leads to the development of the amyloid
y y y y y y y y y y y


deposits?
y

,An increase in glycogen formation in the brain cells
y y y y y y y y




Aggregation of the proteins in the brain
y y y y y y




Secretion of glucagon, leading to excessive ketogenesis
y y y y y y




An increase in anaerobic metabolism of glucose in the brain
y y y y y y y y y yyyyyy correct answers >>
y y y


Aggregation of the proteins in the brain
yy y y y y y y




This question is describing changes in protein structure. Aggregation occurs when
y y y y y y y y y y


proteins clump together inappropriately, causing plaques like amyloid deposits to
y y y y y y y y y y


accumulate.
y




Which level of protein structure is determined by the sequence of amino acids?
y y y y y y y y y y y y




Secondary structure y




Quaternary structure y




Tertiary structure
y




Primary structurey yyyyyy correct answers >> Primary structure
y y yyy y




The primary structure of a protein is simply the sequence of amino acids held
y y y y y y y y y y y y y


together by peptide bonds.
y y y y

, Which force is most influential in determining the secondary structure of a
y y y y y y y y y y y


protein?
y




Hydrophobic effect y




Disulfide bonding y




Hydrogen bonding y




Electrostatic interactions y yyyyyy correct answers >> Hydrogen bonding
y y yyy y




The secondary structure of a protein is built by hydrogen bonds between the
y y y y y y y y y y y y


carboxyl groups and amino groups on the backbones of the amino acids.
y y y y y y y y y y y y




Which amino acid would most likely participate in hydrogen bonds?
y y y y y y y y y yyyyyy correct
answers >> Amino Acid structure 4
y y yyy y y y




This is a polar, uncharged amino acid due to the OH group on the side chain. Polar,
y y y y y y y y y y y y y y y y


uncharged amino acids containing oxygen or NH groups make hydrogen bonds.
y y y y y y y y y y y




Which portion of the amino acid is inside the box?
y y y y y y y y y


y



The box is surrounding the section below the Alpha Carbon
y y y y y y y y y yyyyyy correct answers >> y y yy


Side Chain
y y

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