HESI A2 2025 latest update
HESI A2 2025 LATEST UPDATE WITH ACCURATE
QUESTIONS AND VERIFIED ANSWERS WITH RATIONALES
ALREADY GRADED A+
Which organelle is responsible for generating ATP that is used for chemical energy?
A. mitochondria
B. Golgi apparatus
C. vesicle
D. ribosome - ANSWER-A. mitochondria
The mitochondrion is often referred to as the "power plant" of the cell because it generates
ATP, the cell's source of chemical energy.
Which of these statements is true with regard to eukaryotic and prokaryotic cells?
A. Prokaryotic cells can contain lysosomes
B. Eukaryotic cells have mitochondria
C. Prokaryotic cells can contain lysosomes and eukaryotic cells have mitochondria
D. Prokaryotic cells have a nucleus - ANSWER-B. Eukaryotic cells have mitochondria
One of the major differences between eukaryotic cells and prokaryotic cells is that eukaryotic
cells contain organelles, such as mitochondria and lysosomes, whereas prokaryotic cells do not.
Positive feedback is a mechanism used by the body that results in amplification or enhancement
of a signal that has already been activated. An example of this would be ____.
A. the release of oxytocin to increase contractions during childbirth
B. shivering to increase temperature
, HESI A2 2025 latest update
C. slowing metabolism in response to starvation
D. blood vessels regulating blood pressure - ANSWER-A. the release of oxytocin to increase
contractions during childbirth
Contractions in childbirth are considered a positive feedback loop because each contraction
stimulates the brain to release more oxytocin, which in turn stimulates more contractions.
When placed in a hypotonic solution, what will a cell do?
A. shrink
B. swell
C. disintegrate
D. remain the same - ANSWER-B. swell
Water always moves from areas of higher concentration to lower concentration. A hypotonic
solution contains less solutes and more water than the contents inside of the cell, so water will
move from outside of the cell to inside, causing it to swell.
Which is not an effect of photo-oxidation?
A. loss of surface smoothness
B. increase in brittleness
C. increase in tensile strength
D. discoloration - ANSWER-C. increase in tensile strength
Photo-oxidation occurs when UV light and ozone break down the surface of polymers. The
result is the material becoming more brittle and discolored and less strong and smooth.
Using the Lewis-dot structure model, how many dots would carbon have?
, HESI A2 2025 latest update
A. 6
B. 2
C. 4
D. 8 - ANSWER-C. 4
The number of dots in a Lewis-dot structure model corresponds to the number of valance
electrons for that atom. Because carbon has four valance electrons, its Lewis-dot structure
model would have 4 dots.
Which of these would produce hydrogen ions in an aqueous solution and would turn a litmus
test from blue to red?
A. ammonia
B. lye
C. vinegar
D. detergent - ANSWER-C. vinegar
Blue litmus paper turns red in the presence of an acid. Ammonia, lye, and detergent are basic,
so they would not give off hydrogen ions in an aqueous solution and when added to blue litmus
paper the paper would remain blue.
Dihydrogen monoxide is better known as ____.
A. iodine
B. hydrogen peroxide
C. water
D. table salt - ANSWER-C. water
Dihydrogen monoxide, or H2O, is more commonly known as water.
HESI A2 2025 LATEST UPDATE WITH ACCURATE
QUESTIONS AND VERIFIED ANSWERS WITH RATIONALES
ALREADY GRADED A+
Which organelle is responsible for generating ATP that is used for chemical energy?
A. mitochondria
B. Golgi apparatus
C. vesicle
D. ribosome - ANSWER-A. mitochondria
The mitochondrion is often referred to as the "power plant" of the cell because it generates
ATP, the cell's source of chemical energy.
Which of these statements is true with regard to eukaryotic and prokaryotic cells?
A. Prokaryotic cells can contain lysosomes
B. Eukaryotic cells have mitochondria
C. Prokaryotic cells can contain lysosomes and eukaryotic cells have mitochondria
D. Prokaryotic cells have a nucleus - ANSWER-B. Eukaryotic cells have mitochondria
One of the major differences between eukaryotic cells and prokaryotic cells is that eukaryotic
cells contain organelles, such as mitochondria and lysosomes, whereas prokaryotic cells do not.
Positive feedback is a mechanism used by the body that results in amplification or enhancement
of a signal that has already been activated. An example of this would be ____.
A. the release of oxytocin to increase contractions during childbirth
B. shivering to increase temperature
, HESI A2 2025 latest update
C. slowing metabolism in response to starvation
D. blood vessels regulating blood pressure - ANSWER-A. the release of oxytocin to increase
contractions during childbirth
Contractions in childbirth are considered a positive feedback loop because each contraction
stimulates the brain to release more oxytocin, which in turn stimulates more contractions.
When placed in a hypotonic solution, what will a cell do?
A. shrink
B. swell
C. disintegrate
D. remain the same - ANSWER-B. swell
Water always moves from areas of higher concentration to lower concentration. A hypotonic
solution contains less solutes and more water than the contents inside of the cell, so water will
move from outside of the cell to inside, causing it to swell.
Which is not an effect of photo-oxidation?
A. loss of surface smoothness
B. increase in brittleness
C. increase in tensile strength
D. discoloration - ANSWER-C. increase in tensile strength
Photo-oxidation occurs when UV light and ozone break down the surface of polymers. The
result is the material becoming more brittle and discolored and less strong and smooth.
Using the Lewis-dot structure model, how many dots would carbon have?
, HESI A2 2025 latest update
A. 6
B. 2
C. 4
D. 8 - ANSWER-C. 4
The number of dots in a Lewis-dot structure model corresponds to the number of valance
electrons for that atom. Because carbon has four valance electrons, its Lewis-dot structure
model would have 4 dots.
Which of these would produce hydrogen ions in an aqueous solution and would turn a litmus
test from blue to red?
A. ammonia
B. lye
C. vinegar
D. detergent - ANSWER-C. vinegar
Blue litmus paper turns red in the presence of an acid. Ammonia, lye, and detergent are basic,
so they would not give off hydrogen ions in an aqueous solution and when added to blue litmus
paper the paper would remain blue.
Dihydrogen monoxide is better known as ____.
A. iodine
B. hydrogen peroxide
C. water
D. table salt - ANSWER-C. water
Dihydrogen monoxide, or H2O, is more commonly known as water.
