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WGU Biochemistry OA Exam | Questions with 100% Correct Answers
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WGU Biochemistry OA Exam | Questions with 100% Correct Answers
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WGU Biochemistry OA Exam |Questions with 100% Correct Answers
How do rising blood CO2 levels promote the deoxygenated confirmation of
hemoglobin? - ✔ ✔ CO2 reacts with H2O in the blood & decreases pH,
which promotes the dome confirmation of the heme group.
How does hemoglobin keep blood pH neutral during exercise?
- ✔ ✔ Deoxygenated hemoglobin binds to excess H+
What is occurring in surrounding tissues as the amount of hemoglobin saturated
with oxygen increases? - ✔ ✔ The concentration of hydrogen ions decreases.
Translation - ✔ ✔ -2nd step
-builds protein
(tRNA leaves behind its amino acid, built chain of amino acids)
Factors that favor the oxygenated form of hemoglobin: - ✔ ✔ -increased pH
-decreased CO2
Which metal ion is bound to the porphyrin ring in hemoglobin? - ✔ ✔ Iron
,Which feature of hemoglobin makes it an effective O2 transport molecule? -
✔ ✔ It's affinity for O2 is regulated by pH.
What is a temporary modification to protein structure by kinases that
alters enzyme function? - ✔ ✔ Phosphorylation
Which type of inhibition occurs when a particular drug binds to the allosteric
site of an enzyme and subsequently changes the enzyme's structure? - ✔ ✔
Noncompetitive
Proteases - ✔ ✔ -a class of enzymes
-hydrolyze protein strands into smaller units
-increase pH= significant decrease in protease activity
How do the rates of enzyme catalyzed reactions compare to those of
corresponding uncatalyzed reactions? - ✔ ✔ They are 10^6 to 10^12 times faster.
Which change will likely increase the activity of an enzyme currently at
optimal conditions? - ✔ ✔ Significantly increasing substrate concentrations
What occurs immediately after the appropriate molecule enters the active site of
the enzyme? - ✔ ✔ The enzyme binds to the molecule to form an enzyme
molecule complex.
Are enzymes specific? - ✔ ✔ Yes
, What process is disrupted after a patient invests excessive antacid
that neutralizes the pH of the stomach? - ✔ ✔ Protein catabolism
In Alzheimer's patients, which biochemical event is responsible for their behavior?
- ✔ ✔ Protein aggregation
In which situation would altering a protein structure lead to a disease state?
- ✔ ✔ A mutation aconitase blocks essential step in aerobic metabolism
Which force is most influential in determining the tertiary structure of a protein? -
✔ ✔ Hydrophobic effect
Quaternary structure - ✔ ✔ Large, functional protein structure composed
or smaller proteins with multiple subunits.
Primary - ✔ ✔ Level of protein structure established through the
dehydration synthesis of peptide bonds
Describe the protein gradient of the proton that during aerobic metabolism. -
✔ ✔ There is a higher H+ concentration in the inter membrane space than in
the matrix.
Which complex polysaccharide acts as an energy storing molecule in the liver?
- ✔ ✔ Glycogen
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