MCAT Practice Exam 1 Questions
and Answers 100% Verified
In the chromatography of the reaction mixture, water absorbed on cellulose
functioned as the stationary phase. What was the principal factor determining the
migration of individual components in the sample? - ANSWER - Hydrogen bonding
What assumption is being made if scientists conclude that aspartic acid was formed
by the prebiological synthesis in the passage? - ANSWER - Compound A and cyanide
were available on primitive Earth.
Which of the following statements does NOT correctly describe the dehydration of
malic acid to fumaric acid and maleic acid? - ANSWER - The reaction is
stereospecific.
What type of functional group is formed when aspartic acid reacts with another
amino acid to form a peptide bond? - ANSWER - .An amide group
If 2-pentanol replaces 1-pentanol in the reaction shown in Figure 3, the rate of
substitution is less because: - ANSWER - there is more steric hindrance at the 2-
position of 2-pentanol than at the 1-position of 1-pentanol.
rate of substitution of protonated alcohols is subject to steric hindrance. This
inhibits the ability of nucleophiles to collide with the reacting electrophilic center
and slows the rate of reaction
Which of the following types of orbitals of the central atom are involved in bonding
in octahedral compounds? - ANSWER - d2 sp3
The term "ideal gas" refers to a gas for which certain assumptions have been made.
Which of the following is such an assumption? - ANSWER - Individual molecular
volume and intermolecular forces are negligible.
, The production of a variety of opsins functions to: - ANSWER - enable the detection
of different colors.
The environment of the retinal binding site is most likely: - ANSWER - hydrophobic.
The source of the phosphate groups that are added to rhodopsin is: - ANSWER - ATP.
If a solution containing the compounds shown in Figure 4, is injected into a gas-
liquid chromatograph, the first peak observed in the gc trace is attributable to which
compound? - ANSWER - 2-Methyl-2-butene
2-methyl-2-butene will exhibit the lowest molecular weight and also the weakest
intermolecular forces of attraction. This substance will therefore migrate the fastest
and be the first peak in the gas chromatograph (gc) trace.
Acetic acid and ethanol react to form an ester product as shown below.
In determining which reactant loses the -OH group, which of the following isotopic
substitutions would be most useful? - ANSWER - Replace the hydroxyl oxygen of
ethanol with O-18.
this experiment involves labeling a group which does not exchange with other
groups present prior to reaction and will therefore give information about the true
identity of the groups, which are exchanged during the reaction.
A person, whose eye has a lens-to-retina distance of 2.0 cm, can only clearly see
objects that are closer than 1.0 m away. What is the strength S of the person's eye
lens? (Note: Use the thin lens formula 1/O+1/I=S.) - ANSWER - 51 D
Which statement correctly describes how enzymes affect chemical reactions?
Stabilization of: - ANSWER - the transition state changes the activation energy of the
reaction.
Which of the following will decrease the percentage ionization of 1.0 M acetic acid,
CH3CO2H(aq)? - ANSWER - Adding concentrated HCl(aq)
and Answers 100% Verified
In the chromatography of the reaction mixture, water absorbed on cellulose
functioned as the stationary phase. What was the principal factor determining the
migration of individual components in the sample? - ANSWER - Hydrogen bonding
What assumption is being made if scientists conclude that aspartic acid was formed
by the prebiological synthesis in the passage? - ANSWER - Compound A and cyanide
were available on primitive Earth.
Which of the following statements does NOT correctly describe the dehydration of
malic acid to fumaric acid and maleic acid? - ANSWER - The reaction is
stereospecific.
What type of functional group is formed when aspartic acid reacts with another
amino acid to form a peptide bond? - ANSWER - .An amide group
If 2-pentanol replaces 1-pentanol in the reaction shown in Figure 3, the rate of
substitution is less because: - ANSWER - there is more steric hindrance at the 2-
position of 2-pentanol than at the 1-position of 1-pentanol.
rate of substitution of protonated alcohols is subject to steric hindrance. This
inhibits the ability of nucleophiles to collide with the reacting electrophilic center
and slows the rate of reaction
Which of the following types of orbitals of the central atom are involved in bonding
in octahedral compounds? - ANSWER - d2 sp3
The term "ideal gas" refers to a gas for which certain assumptions have been made.
Which of the following is such an assumption? - ANSWER - Individual molecular
volume and intermolecular forces are negligible.
, The production of a variety of opsins functions to: - ANSWER - enable the detection
of different colors.
The environment of the retinal binding site is most likely: - ANSWER - hydrophobic.
The source of the phosphate groups that are added to rhodopsin is: - ANSWER - ATP.
If a solution containing the compounds shown in Figure 4, is injected into a gas-
liquid chromatograph, the first peak observed in the gc trace is attributable to which
compound? - ANSWER - 2-Methyl-2-butene
2-methyl-2-butene will exhibit the lowest molecular weight and also the weakest
intermolecular forces of attraction. This substance will therefore migrate the fastest
and be the first peak in the gas chromatograph (gc) trace.
Acetic acid and ethanol react to form an ester product as shown below.
In determining which reactant loses the -OH group, which of the following isotopic
substitutions would be most useful? - ANSWER - Replace the hydroxyl oxygen of
ethanol with O-18.
this experiment involves labeling a group which does not exchange with other
groups present prior to reaction and will therefore give information about the true
identity of the groups, which are exchanged during the reaction.
A person, whose eye has a lens-to-retina distance of 2.0 cm, can only clearly see
objects that are closer than 1.0 m away. What is the strength S of the person's eye
lens? (Note: Use the thin lens formula 1/O+1/I=S.) - ANSWER - 51 D
Which statement correctly describes how enzymes affect chemical reactions?
Stabilization of: - ANSWER - the transition state changes the activation energy of the
reaction.
Which of the following will decrease the percentage ionization of 1.0 M acetic acid,
CH3CO2H(aq)? - ANSWER - Adding concentrated HCl(aq)
