MCAT Practice Exam – Part 1 Newest With
100 Complete Questions And Correct
Detailed Answers| Brand New Version!
1. A mutation replaces a charged amino acid with a
nonpolar amino acid in the interior of a protein.
Which effect is most likely?
A. Increased protein solubility
B. Protein misfolding
C. Increased enzymatic activity
D. No change in structure
Correct Answer: B
Nonpolar residues in the protein core help stabilize
tertiary structure; disrupting this can cause
misfolding.
2. Which bond is broken when ATP is hydrolyzed to
ADP?
A. Phosphoester bond
B. Hydrogen bond
C. Glycosidic bond
D. Phosphoanhydride bond
,Correct Answer: D
ATP hydrolysis breaks a phosphoanhydride bond
between phosphate groups, releasing energy.
3. Which organelle is primarily responsible for lipid
synthesis?
A. Rough endoplasmic reticulum
B. Golgi apparatus
C. Smooth endoplasmic reticulum
D. Lysosome
Correct Answer: C
The smooth ER synthesizes lipids and steroids and
detoxifies drugs.
4. A decrease in blood pH will cause hemoglobin to:
A. Bind oxygen more tightly
B. Release oxygen more readily
C. Denature completely
D. Increase affinity for carbon dioxide
Correct Answer: B
The Bohr effect explains that lower pH decreases
hemoglobin’s oxygen affinity.
, 5. Which amino acid is most likely to be found in a
transmembrane domain?
A. Aspartate
B. Lysine
C. Valine
D. Glutamate
Correct Answer: C
Hydrophobic amino acids like valine interact favorably
with lipid bilayers.
6. Which type of RNA carries amino acids to the
ribosome?
A. mRNA
B. rRNA
C. snRNA
D. tRNA
Correct Answer: D
Transfer RNA delivers specific amino acids during
translation.
, 7. Which equation best describes diffusion?
A. PV = nRT
B. ΔG = ΔH − TΔS
C. F = ma
D. J = −D(dC/dx)
Correct Answer: D
Fick’s law describes diffusion as flux proportional to
the concentration gradient.
8. During which phase of mitosis do sister chromatids
separate?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Correct Answer: C
Anaphase is marked by separation of sister
chromatids toward opposite poles.
9. A competitive inhibitor affects which enzyme
parameter?
A. Decreases Vmax
B. Increases Km
100 Complete Questions And Correct
Detailed Answers| Brand New Version!
1. A mutation replaces a charged amino acid with a
nonpolar amino acid in the interior of a protein.
Which effect is most likely?
A. Increased protein solubility
B. Protein misfolding
C. Increased enzymatic activity
D. No change in structure
Correct Answer: B
Nonpolar residues in the protein core help stabilize
tertiary structure; disrupting this can cause
misfolding.
2. Which bond is broken when ATP is hydrolyzed to
ADP?
A. Phosphoester bond
B. Hydrogen bond
C. Glycosidic bond
D. Phosphoanhydride bond
,Correct Answer: D
ATP hydrolysis breaks a phosphoanhydride bond
between phosphate groups, releasing energy.
3. Which organelle is primarily responsible for lipid
synthesis?
A. Rough endoplasmic reticulum
B. Golgi apparatus
C. Smooth endoplasmic reticulum
D. Lysosome
Correct Answer: C
The smooth ER synthesizes lipids and steroids and
detoxifies drugs.
4. A decrease in blood pH will cause hemoglobin to:
A. Bind oxygen more tightly
B. Release oxygen more readily
C. Denature completely
D. Increase affinity for carbon dioxide
Correct Answer: B
The Bohr effect explains that lower pH decreases
hemoglobin’s oxygen affinity.
, 5. Which amino acid is most likely to be found in a
transmembrane domain?
A. Aspartate
B. Lysine
C. Valine
D. Glutamate
Correct Answer: C
Hydrophobic amino acids like valine interact favorably
with lipid bilayers.
6. Which type of RNA carries amino acids to the
ribosome?
A. mRNA
B. rRNA
C. snRNA
D. tRNA
Correct Answer: D
Transfer RNA delivers specific amino acids during
translation.
, 7. Which equation best describes diffusion?
A. PV = nRT
B. ΔG = ΔH − TΔS
C. F = ma
D. J = −D(dC/dx)
Correct Answer: D
Fick’s law describes diffusion as flux proportional to
the concentration gradient.
8. During which phase of mitosis do sister chromatids
separate?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Correct Answer: C
Anaphase is marked by separation of sister
chromatids toward opposite poles.
9. A competitive inhibitor affects which enzyme
parameter?
A. Decreases Vmax
B. Increases Km
