The Ultimate MCAT Practice Questions
with Latest 2025-2026 Correct
Answers GRADED A+
(III) Differences between the right and left ventricle of the
heart
- ANS - Right ventricle: feeds pulmonary circulation; generates
less force and faces less resistance (bc circulation is much
shorter)
Left ventricle: feeds systemic circulation, generates more force
and faces more resistance (bc longer circulation)
(III) In an electric field (such as one that would be used in SDS
PAGE), what charges are the anodes and cathodes?
- ANS - Anode: positively charged
Cathode: negatively charged
(III) What is mutarotation?
- ANS - The initial opening and subsequent closing of a cyclic
hemiacetal chain, resulting in a mixture of anomers (alpha and
beta)
,(III) What is the difference between (d)- and D- configurations
in stereochemistry?
- ANS - (d)- means dextrorotatory. D- refers to a molecule with
a chiral carbon similar to D-glyceraldehyde (which is actually
levorotatory)
(III) What is a vector?
- ANS - The sum of all displacements
(III) What is the essence of the continuity equation (in laminar
flow)?
- ANS - While velocity of fluid at a more narrow point (smaller
cross-sectional area) is greater than at wider points, the
volume displaced per given time is always the same
(III) Why does it matter whether a pipe is open or closed when
understanding sound harmonics?
- ANS - If a pipe has one closed end, then only odd harmonics
can exist
(III) How does one calculate efficiency?
- ANS - (load x load distance) / (effort x effort distance)
Work output / Work input
,(III) What is Benedict's reagent?
- ANS - A common reagent used to test for reducing sugars
(sugars with hemiacetal groups)
(III) How do we number a sugar chain that forms rings?
- ANS - Number them in the direction from left to right in the
planar structure, right to left in the chair conformation (from
the nucleophilic substituent to the carbonyl carbon)
(III) When an enzyme is saturated with substrate, what effect
does adding more substrate do?
- ANS - No significant effect
(III) What is the periodic trend of effective nuclear charge?
- ANS - it increases from left to right across periodic table
because of increase in positive charge in nucleus
it decreases as one descends a group because of a larger
electron cloud (more inner electrons)
(III) What is the primary factor that changes a solubility
product constant (Ksp)?
- ANS - Temperature
*Important Takeaway*: Concentrations do NOT affect Ksp
, (III) What changes during a phase change?
- ANS - Entropy and Density
(III) Describe acid anhydrides.
- ANS - They're highly reactive compounds, formed by
condensation of two carboxylic acids. They're NOT soluble in
water due to their high reactivity
(III) What does chymotrypsin do?
- ANS - It preferentially cleaves peptide bonds next to large
hydrophobic amino acids.
(III) What kind of reactants can undergo aldol condensation?
- ANS - Aldehydes!
(III) Describe the pathway of blood flow
- ANS - As blood moves from heart to lungs, moving to slightly
greater height. Then oxygenated blood returns back to heart
and leaves the aorta in a upward direction, circulates
throughout the body, and returns back up to the heart through
the veins
(III) How is serotonin released from neurons?
- ANS - Via exocytosis (only way many many molecules can be
released from the cell at one time)
with Latest 2025-2026 Correct
Answers GRADED A+
(III) Differences between the right and left ventricle of the
heart
- ANS - Right ventricle: feeds pulmonary circulation; generates
less force and faces less resistance (bc circulation is much
shorter)
Left ventricle: feeds systemic circulation, generates more force
and faces more resistance (bc longer circulation)
(III) In an electric field (such as one that would be used in SDS
PAGE), what charges are the anodes and cathodes?
- ANS - Anode: positively charged
Cathode: negatively charged
(III) What is mutarotation?
- ANS - The initial opening and subsequent closing of a cyclic
hemiacetal chain, resulting in a mixture of anomers (alpha and
beta)
,(III) What is the difference between (d)- and D- configurations
in stereochemistry?
- ANS - (d)- means dextrorotatory. D- refers to a molecule with
a chiral carbon similar to D-glyceraldehyde (which is actually
levorotatory)
(III) What is a vector?
- ANS - The sum of all displacements
(III) What is the essence of the continuity equation (in laminar
flow)?
- ANS - While velocity of fluid at a more narrow point (smaller
cross-sectional area) is greater than at wider points, the
volume displaced per given time is always the same
(III) Why does it matter whether a pipe is open or closed when
understanding sound harmonics?
- ANS - If a pipe has one closed end, then only odd harmonics
can exist
(III) How does one calculate efficiency?
- ANS - (load x load distance) / (effort x effort distance)
Work output / Work input
,(III) What is Benedict's reagent?
- ANS - A common reagent used to test for reducing sugars
(sugars with hemiacetal groups)
(III) How do we number a sugar chain that forms rings?
- ANS - Number them in the direction from left to right in the
planar structure, right to left in the chair conformation (from
the nucleophilic substituent to the carbonyl carbon)
(III) When an enzyme is saturated with substrate, what effect
does adding more substrate do?
- ANS - No significant effect
(III) What is the periodic trend of effective nuclear charge?
- ANS - it increases from left to right across periodic table
because of increase in positive charge in nucleus
it decreases as one descends a group because of a larger
electron cloud (more inner electrons)
(III) What is the primary factor that changes a solubility
product constant (Ksp)?
- ANS - Temperature
*Important Takeaway*: Concentrations do NOT affect Ksp
, (III) What changes during a phase change?
- ANS - Entropy and Density
(III) Describe acid anhydrides.
- ANS - They're highly reactive compounds, formed by
condensation of two carboxylic acids. They're NOT soluble in
water due to their high reactivity
(III) What does chymotrypsin do?
- ANS - It preferentially cleaves peptide bonds next to large
hydrophobic amino acids.
(III) What kind of reactants can undergo aldol condensation?
- ANS - Aldehydes!
(III) Describe the pathway of blood flow
- ANS - As blood moves from heart to lungs, moving to slightly
greater height. Then oxygenated blood returns back to heart
and leaves the aorta in a upward direction, circulates
throughout the body, and returns back up to the heart through
the veins
(III) How is serotonin released from neurons?
- ANS - Via exocytosis (only way many many molecules can be
released from the cell at one time)
