MCAT Biology Practice Latest Exam
Questions and Answers, A+ Guarantee
2026
Glucose typically enters the cell through which mechanism?
A. Simple diffusion through the cell membrane
B. Facilitated diffusion through a carrier protein
C. Pinocytosis through a channel protein
D. Active transport by a glucose transport protein - Correct
Answers ✅Facilitated diffusion through a carrier protein
Glucose is too large and polar to move quickly through the
cell membrane by simple diffusion.
Typically the concentration of glucose outside the cell is
higher than inside the cell.
Since glucose is moving down a concentration gradient by
entering the cell, the process does not require ATP.
Glucose typically enters cells by facilitated diffusion through
a carrier protein.
Which type of membrane protein is most likely to be a
hormone?
A. Lipid-bound protein
,MCAT Biology Practice Latest Exam
Questions and Answers, A+ Guarantee
2026
B. Peripheral protein
C. Integral protein
D. Steroid - Correct Answers ✅Peripheral protein
Hormones move through the circulatory system, acting as
signaling molecules to specific organs/cells.
A steroid is not a membrane protein.
An integral protein can not easily leave the cell membrane
and would therefore be a poor signaling molecule.
Lipid-bound proteins remain within the phospholipid bilayer
by the fatty acid tails of phospholipids. They would also be
poor signaling molecules.
Peptide hormones like insulin and growth hormone interact
with integral protein receptors in cell membranes. These
hormones can be considered peripheral membrane proteins.
Pulmonary edema occurs when fluid builds up in the
interstitium between the pulmonary capillaries and the
alveoli, and eventually enters the alveoli. How do you
decrease the risk of pulmonary edema?
,MCAT Biology Practice Latest Exam
Questions and Answers, A+ Guarantee
2026
A. Decrease hydrostatic pressure and increase osmotic
pressure
B. Decrease hydrostatic pressure and decrease osmotic
pressure
C. Increase hydrostatic pressure and decrease osmotic
pressure
D. Increase hydrostatic pressure and increase osmotic
pressure - Correct Answers ✅Decrease hydrostatic
pressure and increase osmotic pressure
Hydrostatic pressure is the pressure a liquid exerts on its
container, and reflects the volume of liquid in a space.
Osmotic pressure is the pressure required to prevent
movement across a semipermeable membrane, and reflects
the protein content of the blood.
To decrease the risk of pulmonary edema, hydrostatic
pressure exerted by the fluid must decrease, and osmotic
pressure exerted on the fluid must increase.
At what point does crossing over between sister chromatids
occur?
, MCAT Biology Practice Latest Exam
Questions and Answers, A+ Guarantee
2026
A. During anaphase I of meiosis
B. During prophase I of meiosis
C. During anaphase II of meiosis
D. During prophase II of meiosis - Correct Answers
✅During prophase I of meiosis
Crossing over is a form of genetic recombination in which
homologous chromosomes pair up and exchange pieces of
their genetic material. Crossing over occurs in prophase I of
meiosis, and is often referred to as synapsis. However,
crossing over occurs between homologous chromosomes,
and not between the sister chromatids of an individual
chromosome. Sister chromatids are identical pieces of DNA
joined at the centromere to make up one chromosome.
Your trachea have short hair-like cell process that move the
mucus. What is the name of these hair like structures and
which cytoskeletal elements form them?
A. Cilia, microfilaments
B. Villi, microfilaments
C. Villi, microtubules
D. Cilia, microtubules - Correct Answers ✅Cilia,
microtubules
Questions and Answers, A+ Guarantee
2026
Glucose typically enters the cell through which mechanism?
A. Simple diffusion through the cell membrane
B. Facilitated diffusion through a carrier protein
C. Pinocytosis through a channel protein
D. Active transport by a glucose transport protein - Correct
Answers ✅Facilitated diffusion through a carrier protein
Glucose is too large and polar to move quickly through the
cell membrane by simple diffusion.
Typically the concentration of glucose outside the cell is
higher than inside the cell.
Since glucose is moving down a concentration gradient by
entering the cell, the process does not require ATP.
Glucose typically enters cells by facilitated diffusion through
a carrier protein.
Which type of membrane protein is most likely to be a
hormone?
A. Lipid-bound protein
,MCAT Biology Practice Latest Exam
Questions and Answers, A+ Guarantee
2026
B. Peripheral protein
C. Integral protein
D. Steroid - Correct Answers ✅Peripheral protein
Hormones move through the circulatory system, acting as
signaling molecules to specific organs/cells.
A steroid is not a membrane protein.
An integral protein can not easily leave the cell membrane
and would therefore be a poor signaling molecule.
Lipid-bound proteins remain within the phospholipid bilayer
by the fatty acid tails of phospholipids. They would also be
poor signaling molecules.
Peptide hormones like insulin and growth hormone interact
with integral protein receptors in cell membranes. These
hormones can be considered peripheral membrane proteins.
Pulmonary edema occurs when fluid builds up in the
interstitium between the pulmonary capillaries and the
alveoli, and eventually enters the alveoli. How do you
decrease the risk of pulmonary edema?
,MCAT Biology Practice Latest Exam
Questions and Answers, A+ Guarantee
2026
A. Decrease hydrostatic pressure and increase osmotic
pressure
B. Decrease hydrostatic pressure and decrease osmotic
pressure
C. Increase hydrostatic pressure and decrease osmotic
pressure
D. Increase hydrostatic pressure and increase osmotic
pressure - Correct Answers ✅Decrease hydrostatic
pressure and increase osmotic pressure
Hydrostatic pressure is the pressure a liquid exerts on its
container, and reflects the volume of liquid in a space.
Osmotic pressure is the pressure required to prevent
movement across a semipermeable membrane, and reflects
the protein content of the blood.
To decrease the risk of pulmonary edema, hydrostatic
pressure exerted by the fluid must decrease, and osmotic
pressure exerted on the fluid must increase.
At what point does crossing over between sister chromatids
occur?
, MCAT Biology Practice Latest Exam
Questions and Answers, A+ Guarantee
2026
A. During anaphase I of meiosis
B. During prophase I of meiosis
C. During anaphase II of meiosis
D. During prophase II of meiosis - Correct Answers
✅During prophase I of meiosis
Crossing over is a form of genetic recombination in which
homologous chromosomes pair up and exchange pieces of
their genetic material. Crossing over occurs in prophase I of
meiosis, and is often referred to as synapsis. However,
crossing over occurs between homologous chromosomes,
and not between the sister chromatids of an individual
chromosome. Sister chromatids are identical pieces of DNA
joined at the centromere to make up one chromosome.
Your trachea have short hair-like cell process that move the
mucus. What is the name of these hair like structures and
which cytoskeletal elements form them?
A. Cilia, microfilaments
B. Villi, microfilaments
C. Villi, microtubules
D. Cilia, microtubules - Correct Answers ✅Cilia,
microtubules
