TEST BANK FOR BIOCHEMISTRY, CAMPBELL – COMPLETE - EXAM QUESTIONS WITH ANSWERS KEY

TEST BANK FOR
BIOCHEMISTRY, CAMPBELL –
COMPLETE - EXAM QUESTIONS WITH
ANSWERS KEY




1. THE DIPOLE MOMENT IN A WATER MOLECULE WHICH STATEMENT
ABOUT HYDROGEN BONDS IS NOT TRUE?
A) HYDROGEN BONDS ACCOUNT FOR THE ANOMALOUSLY HIGH
BOILING POINT OF WATER.
B) IN LIQUID WATER, THE AVERAGE WATER MOLECULE FORMS
HYDROGEN BONDS WITH THREE TO FOUR OTHER WATER
MOLECULES.
C) INDIVIDUAL HYDROGEN BONDS ARE MUCH WEAKER THAN
COVALENT BONDS.
D) INDIVIDUAL HYDROGEN BONDS IN LIQUID WATER EXIST FOR
MANY SECONDS AND SOMETIMES FOR MINUTES.
E) THE STRENGTH OF A HYDROGEN BOND DEPENDS ON THE
LINEARITY OF THE THREE ATOMS INVOLVED IN THE BOND.


2. A TRUE STATEMENT ABOUT HYDROPHOBIC INTERACTIONS IS THAT
THEY:
A) ARE THE DRIVING FORCE IN THE FORMATION OF MICELLES OF
AMPHIPATHIC COMPOUNDS IN WATER.
B) DO NOT CONTRIBUTE TO THE STRUCTURE OF WATER-SOLUBLE
PROTEINS.
C) HAVE BONDING ENERGIES OF APPROXIMATELY 20–40 KJOULE PER
MOLE.
D) INVOLVE THE ABILITY OF WATER TO DENATURE PROTEINS.
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, E) PRIMARILY INVOLVE THE EFFECT OF POLAR SOLUTES ON THE
ENTROPY OF AQUEOUS SYSTEMS.



3. HYDROPHOBIC INTERACTIONS MAKE IMPORTANT ENERGETIC
CONTRIBUTIONS TO:
A) BINDING OF A HORMONE TO ITS RECEPTOR PROTEIN.
B) ENZYME-SUBSTRATE INTERACTIONS.
C) MEMBRANE STRUCTURE.
D) THREE-DIMENSIONAL FOLDING OF A POLYPEPTIDE CHAIN.
E) ALL OF THE ANSWERS ARE CORRECT.



4. DISSOLVED SOLUTES ALTER SOME PHYSICAL (COLLIGATIVE)
PROPERTIES OF THE SOLVENT WATER BECAUSE THEY CHANGE
THE:
A) CONCENTRATION OF THE WATER.
B) HYDROGEN BONDING OF THE WATER.
C) IONIC BONDING OF THE WATER.
D) PH OF THE WATER.




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, E) TEMPERATURE OF THE WATER.



5. OSMOSIS IS MOVEMENT OF A:
A) CHARGED SOLUTE MOLECULE (ION) ACROSS A MEMBRANE.
B) GAS MOLECULE ACROSS A MEMBRANE.
C) NONPOLAR SOLUTE MOLECULE ACROSS A MEMBRANE.
D) POLAR SOLUTE MOLECULE ACROSS A MEMBRANE.
E) WATER MOLECULE ACROSS A MEMBRANE.



6. A HYDRONIUM ION:
A) HAS THE STRUCTURE H3O+.
B) IS A HYDRATED HYDROGEN ION.
C) IS A HYDRATED PROTON.
D) IS THE USUAL FORM OF ONE OF THE DISSOCIATION PRODUCTS OF
WATER IN SOLUTION.
E) ALL OF THE ANSWERS ARE CORRECT.



7. THE PH OF A SOLUTION OF 1 M HCL IS:
A) 0.
B) 0.1.
C) 1.
D) 10.
E) –1.



8. THE PH OF A SOLUTION OF 0.1 M NAOH IS:
A) 0.1.
B) 1.0.
C) 12.8.
D) 13.
E) 14.




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, 9. WHICH STATEMENT IS TRUE ABOUT THE PROPERTIES OF AQUEOUS
SOLUTIONS?
A) A PH CHANGE FROM 5.0 TO 6.0 REFLECTS AN INCREASE IN THE
HYDROXIDE ION CONCENTRATION ([OH–]) OF 20%.
B) A PH CHANGE FROM 8.0 TO 6.0 REFLECTS A DECREASE IN THE
PROTON CONCENTRATION ([H+]) BY A FACTOR OF 100.
C) CHARGED MOLECULES ARE GENERALLY INSOLUBLE IN WATER.
D) HYDROGEN BONDS FORM READILY IN AQUEOUS SOLUTIONS.
E) THE PH CAN BE CALCULATED BY ADDING 7 TO THE VALUE OF THE
POH.



10. THE PH OF A SAMPLE OF BLOOD IS 7.4, WHILE GASTRIC JUICE IS PH 1.4.
THE BLOOD SAMPLE HAS:
A) 0.189 TIMES THE [H+] AS THE GASTRIC JUICE.
B) 5.29 TIMES LOWER [H+] THAN THE GASTRIC JUICE.
C) 6 TIMES LOWER [H+] THAN THE GASTRIC JUICE.
D) 6000 TIMES LOWER [H+] THAN THE GASTRIC JUICE.
E) ONE MILLION TIMES LOWER [H+] THAN THE GASTRIC JUICE.



11. THE AQUEOUS SOLUTION WITH THE LOWEST PH IS:
A) 0.01 M HCL.
B) 0.1 M ACETIC ACID (PKA = 4.86).
C) 0.1 M FORMIC ACID (PKA = 3.75).
D) 0.1 M HCL.
E) 10–12 M NAOH.



12. THE AQUEOUS SOLUTION WITH THE HIGHEST PH IS:
A) 1 M HCL.
B) 1 M NH3 (PKA = 9.25).
C) 0.5 M NAHCO3 (PKA = 3.77).
D) 0.1 M NAOH.
E) 0.001 M NAOH.




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