HESI A2 Biology Exam Practice Test 130 Questions with Verified Answers & Rationale | 100% Correct (Latest 2025/2026).

HESI A2 Biology Exam Practice Test i,- i,- i,- i,- i,- i,-




130 Questions with Verified Answers
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& Rationale | 100% Correct i,- i,- i,- i,- i,-




(Latest 2025/2026). i,-




Which of the following is NOT a part of the body's chemical
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defense system against infection?
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a. Urine
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b. Hydrochloric acid
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c. Agranulocyte
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d. Lysozyme
i,- i,-i,- i,- - Agranulocytes
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Agranulocytes are a type of white blood cell and therefore are i,- i,- i,- i,- i,- i,- i,- i,- i,- i,- i,-



not a part of the body's chemical defense system.
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Which of the following is considered an example of naturally
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acquired passive immunity? i,- i,-




a. Attenuated (live) vaccine injection
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b. Breastfeeding
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,c. Inactivated (killed) vaccine injection
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d. Exposure to a disease and subsequent immunity
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breastfeeding
Natural passive immunity occurs when live antibodies are
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transferred from one individual to another, such as when anti-
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bodies are transferred from a mother to her baby via breast milk.
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Worms lack which of the following?
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a. Eyes and brain
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b. Brain
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c. Eyes
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d. Nerve centers
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Worms lack both eyes and a brain, but they do have nerve centers.
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Which organelle is responsible for generating ATP that is used for
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chemical energy? i,-




a. Mitochondria
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b. Vesicle
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c. Ribosome
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d. Golgi apparatus
i,- i,- i,-i,- i,- - mitochondria
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,The mitochondrion is often referred to as the "power plant" of
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the cell, because it generates ATP, the cell's source of chemical
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energy.


Which of the following is true with regard to eukaryotic and
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prokaryotic cells? i,-




a. Prokaryotic cells can contain lysosomes.
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b. Eukaryotic cells have mitochondria.
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c. Prokaryotic cells can contain lysosomes and eukaryotic cells
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have mitochondria.
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d. Prokaryotic cells have a nucleus.
i,- i,- i,- i,- i,- i,-i,- i,- - Eukaryotic cells have
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mitochondria.
One of the major differences between eukaryotic cells and
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prokaryotic cells is that eukaryotic cells contain organelles, such
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as mitochondria, whereas prokaryotic cells do not.
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Positive feedback is a mechanism used by the body that results in
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amplification or enhancement of a signal that has already been i,- i,- i,- i,- i,- i,- i,- i,- i,- i,-



activated. An example of this would be: i,- i,- i,- i,- i,- i,-




a. Slowing metabolism in response to starvation
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b. Shivering to increase temperature
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, c. Blood vessels regulating blood pressure
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d. The release of oxytocin to increase contractions during
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childbirth - The release of oxytocin to increase contractions
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during childbirth i,-




Contractions in childbirth are considered a positive feedback loop
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because each contraction stimulates the brain to release more
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Oxytocin, which in turn stimulates more contractions.
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When placed in a hypotonic solution, a cell will do which of the
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following?


a. Remain the same
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b. Disintegrate
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c. Swell
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d. Shrink
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Water always moves from areas of higher concentration to lower
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concentration. A hypotonic solution contains less solutes and i,- i,- i,- i,- i,- i,- i,- i,-



more water then the contents inside of the cell, so water will
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move from outside of the cell to inside, causing it to swell.
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Which is NOT an effect of photo-oxidation?
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a. Increase in tensile strength
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