Question: Why does the hydrolysis of ATP to ADP have a middle of the road, negative delta G value?
Answer Choices:
(Not visible)
Answer: The products have lower free energy due to resonance stabilization and electrostatic repulsion
Question: Determine the ΔG°’ of a reaction at standard pressure, 25°C, and with a Keq of 10⁻⁴.
Answer Choices:
-28.3 kJ/mol
-13.4 kJ/mol
-5.7 kJ/mol
+5.7 kJ/mol
+13.4 kJ/mol
Answer: +22.8 kJ/mol
Question: When measuring the effects of pH, how did the authors prove that the ionic strength of the buffer being used wasn’t leading to false data?
Answer Choices:
They used all the same concentrations of buffers.
They used all the same buffers.
They used different buffers at each pH.
They didn’t use buffers at all.
None of the above
Answer: They used different buffers at each pH.
Question: Which of the following statements is not true of the mitochondrial matrix?
Answer Choices:
It contains the same DNA as your paternal progenitor.
It contains circular DNA molecules.
It contains all of the necessary components in the matrix for protein synthesis.
It has a gel-like consistency.
It has a high concentration of enzymes and ions.
Answer: It contains the same DNA as your paternal progenitor.
Question: What is the reaction potential for the overall reaction?
Answer Choices:
+0.00 V
+0.03 V
+0.13 V
-0.22 V
-0.51 V
Answer: -0.22 V
Question: Why did the mutation of the D309N ruin the effect of human aromatase expressed in E. Coli?
Answer Choices:
D is polar and N is nonpolar
D can be titrated and N is not titratable
D is polar and so is N
D cannot be titrated and N can be titrated
None of the above
Answer: D. can be titrated and N is not titratable
Question: Which of the following groups of molecules can participate in a hydrogen bond as a hydrogen bond donor?
Answer Choices:
NH3⁺
CH3
C=O
C≡N⁺
Answer: NH3⁺
Question: The following molecule is an example of which class of compounds? CH3CH2CH2COOCH2CH3
Answer Choices:
Hydrocarbon
Acid
Ester
Ether
Aldehyde
Answer: Ester
Question: What is the function of the aromatase enzyme?
Answer Choices:
It kills a lysine
It transforms cholesterol to sugars
It changes testosterone to estrogen (17β-estradiol)
It phosphorylates a serine on estrogen
None of the above
Answer: It changes testosterone to estrogen (17β-estradiol)
Question: A hydrogen bond is best defined as:
Answer Choices:
A strong chemical bond between hydrogen and another element
A weak chemical bond between hydrogen and another element
One of the strongest electrostatic bonds between hydrogen and oxygen or nitrogen
The weakest electrostatic bond between hydrogen and oxygen or nitrogen
A bond between two hydrogen atoms
Answer: O. ne of the strongest electrostatic bonds between hydrogen and oxygen or nitrogen
Question: Which of the following factors is responsible for the fact that water is a liquid at room temperature?
Answer Choices:
Covalent O-H bonds
ionic bonds
hydrogen bonds
Hydrophobic bonding between water molecules
The molecular weight of water
Answer: hydrogen bonds
Question: In place of a nucleus a prokaryotic cell has a __________.
Answer Choices:
Mesosome
Carboxysome
Nucleoid
Ribozyme
Reticulosome
Answer: Nucleoid
Question: The plasma membrane __________.
Answer Choices:
Provides support
Is present only in eukaryotes
Controls the flow of substances in and out of the cell
Is present only in prokaryotes
Both A and C are correct
Answer: Controls the flow of substances in and out of the cell