Equation Test 1
.
- 1.
The term used to indicate the degree of randomness within a system is
- A.
Enthalpy
- B.
Entropy
- C.
H-TS
- D.
Q/T
- E.
Delta G
Correct Answer
B. Entropy -
- 2.
The biological classification system categorizes organisms into the domains:
- A.
Bacteria, eukarya, and vertebrate
- B.
Archaea and eukarya
- C.
Bacteria, eukarya, and archaea
- D.
Eukarya and bacteria
- E.
None of the rest
Correct Answer
C. Bacteria, eukarya, and archaea -
- 3.
If gas molecules in an enclosed space are allowed to enter a second chamber, the resulting redistribution of gas molecules represents an increase in
- A.
Enthalpy
- B.
Entropy
- C.
Force
- D.
Enthalpy and force
- E.
All of the rest
Correct Answer
B. Entropy -
- 4.
Which of the following is a similarity between all prokaryotes and all eukaryotes?
- A.
Both contain DNA in a nucleus
- B.
Both contain certain of the same membrane bound cell organelles (like mitochondria, Golgi complexes etc)
- C.
Both have a cytoskeleton
- D.
All of the rest are similarities between prokaryotes and eukaryotes
- E.
None of the rest are similarities between prokaryotes and eukaryotes
Correct Answer
C. Both have a cytoskeletonExplanation
"None of the rest are similarities between prokaryotes and eukaryotes" was also acceptedRate this question:
-
- 5.
Which of the following statements concerning prokaryotes is false?
- A.
Prokaryotes are made up of two major groupings: the eubacteria and the archaea, which are as different from each other as from the eukaryotes
- B.
Prokaryotes are generally much smaller than the eukaryotic cells
- C.
Prokaryotes are one branch of the newer, more accurate phylogenic tree made up of prokarya, archaea and eukarya
- D.
Prokaryotes do not have organelles
- E.
None of the rest
Correct Answer
C. Prokaryotes are one branch of the newer, more accurate phylogenic tree made up of prokarya, archaea and eukarya -
- 6.
A spontaneous process
- A.
Occurs without the addition of free energy
- B.
Has a delta G < 0
- C.
Is exergonic
- D.
All of the rest
- E.
None of the rest
Correct Answer
D. All of the rest -
- 7.
An increase in disorder
- A.
Is found in every exergonic process
- B.
Is characteristic of a system increasing in enthalpy
- C.
Is required for a process to be spontaneous
- D.
Results in a decrease in entropy
- E.
Results in the factor T delta S being positive
Correct Answer
E. Results in the factor T delta S being positive -
- 8.
Phosphate, with a pK2 of 6.82, will be mostly in the HPO4(2-) form at pH 7.2. At pH 5.82 it is mostly in the _________________________ forms.
- A.
H3PO4
- B.
H2PO4(1-)
- C.
HPO4(2-)
- D.
PO4(3-)
- E.
None of the rest
Correct Answer
B. H2PO4(1-) -
- 9.
A solution of buffer at a pH of 8.5 with a pK = 7.5 would have more capacity to buffer the addition of
- A.
Acid versus base
- B.
Base versus acid
- C.
PO4(3-)
- D.
HPO4(2-) and PO4(3-)
- E.
None of the rest
Correct Answer
A. Acid versus base -
- 10.
A phosphate buffer solution at a pH = pK1 = 2.15 would have equal amounts of phosphate in the ____________ form and the H2PO4(1-) form.
- A.
HPO4(2-)
- B.
H2PO4(1-)
- C.
H3PO4
- D.
Disordered
- E.
Tetrahedral
Correct Answer
C. H3PO4 -
- 11.
Hydrogen bonds within liquid water:
- A.
Are attractions between the protons of the oxygen nuclei
- B.
Are dipole-dipole attraction
- C.
Are ion-induced dipole attractions
- D.
Are attractions between two hydrogen atoms
- E.
Are attractions between the H(+) and OH(-) ions of the liquid
Correct Answer
B. Are dipole-dipole attraction -
- 12.
In a hydrogen bond between a water molecule and another biomolecule:
- A.
A hydrogen ion on the water molecule forms an ionic bond with a hydride ion on the other molecule
- B.
The partial charge on a hydrogen of the water interacts with the partial charge on a hydrogen of the other molecule
- C.
The hydrogen bond will typically form between a hydrogen atom and either a nitrogen, sulfur, or oxygen atom
- D.
A hydrogen on the water molecule forms a covalent bond to a hydrogen atom on the other molecule
- E.
The hydrogen atom is located between an oxygen atom of the water and a carbon atom of the other molecule
Correct Answer
C. The hydrogen bond will typically form between a hydrogen atom and either a nitrogen, sulfur, or oxygen atom -
- 13.
Hydrophobic interactions between nonpolar molecules or groups:
- A.
Result from the tendency to maximize waterÕs contact with nonpolar molecules
- B.
Require the presence of surrounding water molecules
- C.
Are the result of strong attractions between nonpolar regions
- D.
Are the result of strong repulsion between water and nonpolar regions
- E.
Depend on strong permanent dipoles in the nonpolar molecules
Correct Answer
B. Require the presence of surrounding water molecules -
- 14.
To make a phosphate buffer at pH 6.82 starting with one liter of 10 mM phosphoric acid (H3PO4; pKs are of 2.15, 6.82, and 12.38), you could add
- A.
5 millimoles of HCL
- B.
20 millimoles of K+
- C.
25 millimoles of HCL
- D.
15 millimoles of KOH
- E.
You can't make a buffer by adding HCL or KOH
Correct Answer
D. 15 millimoles of KOH -
- 15.
To make an acetate buffer at pH 4.76 (pK = 4.76) starting with 500 mL of 0.1 M sodium acetate (pK = 4.76), you could add:
- A.
0.1 moles of HCL
- B.
0.025 moles of HCL
- C.
You can't make a buffer by adding HCL or NaOH
- D.
0.1 moles of NaOH
- E.
0.2 moles of HCL
Correct Answer
B. 0.025 moles of HCL -
- 16.
Amphiphilic molecules:
- A.
Have both oxidizing and reducing groups
- B.
Have chromophores in two different wavelength regions
- C.
Have both acidic and basic groups
- D.
Have both hydrophilic and hydrophobic groups
- E.
Are micelles
Correct Answer
D. Have both hydrophilic and hydrophobic groups -
- 17.
Given log (0.00001)=-5; log(0.0001)=-4; and log(0.001)=-3. If you added a drop (about 0.05 mL) of 1.0 M HCL to one liter of pure water (assume pH 7.), the pH would become:
- A.
7.0 (there would be no significant change)
- B.
4.3
- C.
5.0
- D.
2.7
- E.
9.7
Correct Answer
B. 4.3 -
- 18.
What is the ratio of citric acid (pK1=3.09) to monosodium citrate in a 1.0 M citric acid solution with a pH = 2.09?
- A.
10:11
- B.
1:11
- C.
10:1
- D.
1:1
- E.
1:10
Correct Answer
C. 10:1 -
- 19.
Which of the following statements about water is incorrect?
- A.
Water is an excellent solvent for polar molecules.
- B.
Pure water has a concentration of approximately 55.5 M.
- C.
Non-polar molecules do not dissolve in water, but form a separate phase.
- D.
Cations (e.g. Na+) are solvated by shells of water molecules oriented with their hydrogen atoms pointed toward the ions.
- E.
Amphiphilic detergents often form micelles with the polar groups on the outside exposed to the water (solvent) and the non-polar groups sequestered in the interior.
Correct Answer
D. Cations (e.g. Na+) are solvated by shells of water molecules oriented with their hydrogen atoms pointed toward the ions. -
- 20.
The strongest non-covalent interactions are:
- A.
Van der Waal forces
- B.
London dispersion forces
- C.
Hydrogen bonds
- D.
Dipole-dipole interaction
- E.
Ionic interactions
Correct Answer
E. Ionic interactions -
- 21.
Assuming you had a way to measure the amount of protein in a sample of food, which of the following elements would you measure in order to tell whether the food contained protein
- A.
Oxygen
- B.
Hydrogen
- C.
Potassium
- D.
Carbon
- E.
Nitrogen
Correct Answer
E. Nitrogen -
- 22.
The Henderson-Hasselbalch equation, pH = pK + log {[A-] /[HA]} , indicates that when the _____ of a solution containing acid is equal to the _________ of that acid, then the acid is half deprotonated.
- A.
PH and pK
- B.
Base and OH-
- C.
Log pH and log pOH
- D.
H+ and pK
- E.
Log [A-] and pH
Correct Answer
A. PH and pK -
- 23.
What is the final pH of a solution with 50 mL of a stock solution of 2.0 M K2HPO4 and 25 mL of a stock solution of 2.0 M KH2PO4; diluted to a final volume of 200 mL. (pK=6.82; log(1) = 0; log(2)=0.3; log(3)=0.48; log(5)=0.7).
- A.
6.82
- B.
6.52
- C.
7.12
- D.
5.82
- E.
7.3
Correct Answer
C. 7.12 -
- 24.
The free energy change for the reaction A => B at 25 degree C. Given enthalpy (kJ.mol-1) and entropy (J.K-1.mol-1) for A and B are: A enthalpy = 60; entropy = 22; B enthalpy = 75; entropy = 97. Zero degree C = 273 Kelvin. Delta G = Delta H Ð T Delta S.
- A.
-7.4 kJ.mol-1
- B.
7.4 kJ.mol-1
- C.
-3.7 kJ.mol-1
- D.
3.7 kJ.mol-1
- E.
None of the rest
Correct Answer
A. -7.4 kJ.mol-1 -
- 25.
A soccer coach keeps a couple of instant cold packs in her bag in case one of her players suffers a muscle injury. Instant cold packs are composed of a plastic bag containing a smaller water bag and solid ammonium nitrate. In order to activate the fold pack, the bag is kneaded until the smaller water bag breaks, which allows the released water to dissolve the ammonium nitrate. Which of the following statements about the dissolution of ammonium nitrate in water is correct?
- A.
Delta G > 0
- B.
Delta S > 0
- C.
Delta H < 0
- D.
Delta T > 0
- E.
Delta H < Delta S
Correct Answer
B. Delta S > 0 -
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Jan 28, 2016Quiz Edited by
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