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UNE Biochemistry Unit 1 TEST Questions and Answers 100% Pass
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UNE Biochemistry Unit 1 TEST Questions and Answers 100% Pass What is pKa? - -logKa (-log saturation limit) When is a functional group ionized? (with respect to pKa and pH?) - Ionized if pKa is lower than the pH. Protonated if higher than pH. What is an allosteric activator? - Binds to enzyme's...

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  • January 8, 2025
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UNE Biochemistry Unit 1 TEST
Questions and Answers 100% Pass

What is pKa? - ✔✔-logKa (-log saturation limit)


When is a functional group ionized? (with respect to pKa and pH?) - ✔✔Ionized if pKa is lower than the

pH. Protonated if higher than pH.


What is an allosteric activator? - ✔✔Binds to enzyme's active site and helps to activate


What is an allosteric inhibitor? - ✔✔Binds to enzymes active and inhibits activation.


Competitive inhibitors? - ✔✔Compete with substrate for binding at enzyme's substrate recognition site.

This increases Km because it increases the concentration of substrate needed to saturate the enzyme, but

no change to Vmax.


Noncompetitive inhibitor - ✔✔Does not compete with substrate for binding at the enzyme's substrate

recognition site. Lowers concentration of active enzyme so Vmax decreases, but no change to Km.


Ion product of water - ✔✔Kw = [H+][OH-] = 1x10^-14 mol/L


Amino Acid composition (bonds) - ✔✔Central carbon atom connected to a hydrogen, amino (NH3)

group, carboxyl group (COOH), and R group.


In a polypeptide at physiologic pH, hydrogen bonding may occur at: - ✔✔The amide group in the

peptide bond an an aspartyl side chain.




EMILY CHARLENE © 2025, ALL RIGHTS RESERVED 1

, The following shows the linear sequence of atoms joined by covalent bonds in the peptide backbone: -

✔✔N-C-C-N-C-C-N-C-C


Different preparations of insulin contain some insulin complexed with protamine that is absorbed slowly

after injection. Protamin is a protein preparation form rainbow trout sperm containing arginine rich

peptides that bond to insulin. What is the best explanation? - ✔✔Arginine is basic amino acid that binds

to negatively charged amino acid side chains in insulin.


Protein kinases phosphorylate proteins only at a certain hydroxyl groups on amino acid side chains. All

contain side chain hydroxyl groups: - ✔✔Serine, Threonine, Tyrosine


A protein's activity is altered when a particular serine side chain is phosphorylated (Adds negative

charges to side chain). Which of the following amino acid substitutions at this position could lead to

permanent altercation in normal enzyme activity? - ✔✔S->E Glutamate = negative charge - acidic


Decrease of blood pH from 7.5 to 6.5 would be accompanied by the following changes in ion

concentration: - ✔✔A 10 fold increase in concentration of H+


If ammonia NH3 is absorbed and enters circulation, what is the consequence? - ✔✔Ammonia will be

converted to NH4+ ammonium ion in the blood. (pka of ammonia is 9.5 so at physiological ph of 7.4, the

ammonia will be present as ammonium ion, makes blood basic)


Which of the following physiologic/pathological conditions is the most likely to result in alkalosis,

provided that the body could not fully compensate? - ✔✔Repeated vomiting with loss of HCl


Methylmalonate -OOC-CH(CH3)-COO- - ✔✔Conjugate base of weak acid


Characterizes alpha helix regions of proteins - ✔✔alpha helix regions are formed principally by hydrogen

bonds between a carbonyl atom in one peptide and the amide hydrogen from a different peptide.




EMILY CHARLENE © 2025, ALL RIGHTS RESERVED 2

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