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This document has all the correct answers for all the quizes and assesments for biomolecules.
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Quiz 1: Tutorial #1Q. The bond energy of Van der Waals forces are affected by all of the following factors except:
The presence of a catalyst to facilitate the interaction
Determine the priority order and chirality of the following molecule.
A. R (H < CH3 < Cl < Br)
Q. What is the stereoisomeric relation of the 2 molecules below?
A. Diastereomers
Q. Non-chiral carbons are symmetric and achiral? (T or F)
A. True
Q. Using the Cahn-Ingold-Prelog priority system, order the following substituents from highest
priority to lowest priority: CH3, Fluorine (F), Hydroxide (OH), and Hydrogen (H)
A. F, OH, CH3, H
Q. Randomness of a system is increased when the entropy is greater than 0? (T or F)
A. True
Q. Which statement is incorrect regarding the entropy of a reaction?
A. When a compound changes phases the ΔS = 0
Q. Which set of conditions would guarantee a spontaneous reaction regardless of temperature?
A. A negative enthalpy and large positive entropy
Q. For a reaction with ΔH = -8 kJ/mol, ΔS = -30 J/K•mol at 25°C, what can be done to make
this reaction spontaneous?
A. Decrease the temperature of the reaction
,Q.
What is the chirality of the molecule above?
A. R
Q. Which of the following substituents would have the highest priority around a chiral carbon?
A.
Q. How many out of the five molecules shown below is/are achiral?
A. 1
Q. The enthalpy of a reaction is 110 kJ/mol at 298 K and the entropy is 124 J/mol*K. At what
temperature does this reaction become spontaneous?
A. 887 K
Q. A given enzyme reacts under biochemical standard state conditions with ΔH0 = -74100 J/mol,
and ΔS0 = -230 J/mol•K. What is the ΔG0 of the reaction, and is it spontaneous?
A. -5560 J/mol, spontaneous
,Q. Which of the following statements about a reversible chemical reaction that has reached
equilibrium is true? (Only one answer)
A. The Gibbs free energy has reached a minimum
Q. What functional group(s) does the following phosphoserine molecule possess? (circle all that
applies)
A. Amino; Carboxyl; Phosphoryl; Carbonyl
Q. Which of the following shows the equivalent compound to the one pictured?
A. D
Q. Which of the following correctly ranks the interactions from strongest to weakest:
A. Covalent > Ionic > Hydrogen > Dipole-dipole > London Dispersion
Q. Which of the following interactions is typically the weakest?
A. London Dispersion Forces
Q. What are the functional groups circled in A and B?
A. A = carboxyl, B = ester
, Quiz 2: Experiment #1
Q. At the half-equivalence point, pH = Ka of the acid. (T or F)
A. False
Q. A solution is made from 500 mL of 0.5 M HCl and 500 mL of 0.5 M NaOH. The buffer
capacity of the solution is 1.0 mol/L. (T or F)
A. False
Q. The pI of an amino acid always occurs at an equivalence point. (T or F)
A. True
Q. The amino acid arginine is one of 5 "standard" amino acids with a charged side chain. Which
of the following structures is present at the pI of arginine?
A. C
Q. Identify the amino acid based on the following titration curve?
A. Lysine
Q. Weak acids -
A. are only partially ionized in an aqueous solution.
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