ATI TEAS Exam 2027 | Practice Questions &
Correct Answers | Latest Update A+ | Complete
TEAS 7 Exam Prep
1. What cell is similar to T cells?
A) B cells
B) Killer cells
C) Helper cells
D) Memory cells
Answer B: Killer cells
Rationale: Killer (cytotoxic) T cells directly attack infected or cancerous cells. They are a type of
T cell.
2. What hormone responds to stress?
A) Aldosterone
B) Cortisol
C) Insulin
D) Thyroxine
Answer B: Cortisol
Rationale: Cortisol is the primary stress hormone, released by the adrenal cortex to increase
glucose and blood pressure.
3. What hormone helps to regulate sodium?
A) Cortisol
B) Aldosterone
C) ADH
D) Insulin
Answer B: Aldosterone
Rationale: Aldosterone (from adrenal cortex) increases sodium reabsorption and potassium
excretion in the kidneys.
4. What skin layer contains dead cells?
A) Stratum basale
B) Stratum spinosum
C) Stratum corneum
D) Stratum granulosum
Answer C: Stratum corneum
Rationale: The stratum corneum is the outermost layer of the epidermis, composed of dead,
keratinized cells.
, 5. Why is the cell in a hypertonic solution?
A) Water moves into the cell
B) Water moves out of the cell / lower water concentration
C) Solutes move out of the cell
D) No water movement
Answer B: Water moves out of the cell / lower water concentration
Rationale: In a hypertonic solution, solute concentration outside is higher, so water leaves the
cell by osmosis.
6. What releases sodium bicarbonate?
A) Liver
B) Pancreas
C) Stomach
D) Kidneys
Answer B: Pancreas
Rationale: The pancreas releases sodium bicarbonate to neutralize stomach acid in the
duodenum.
7. pH 4 to pH 9 is how many times stronger?
A) 5x
B) 10x
C) 50x
D) 100x
Answer C: 50x
Rationale: pH 4 is 10⁻⁴ M H⁺; pH 9 is 10⁻⁹ M H⁺. The difference is 10⁵ = 100,000? Actually, 10⁻⁴ is
100,000 times stronger than 10⁻⁹? Wait: 10⁻⁴ / 10⁻⁹ = 10⁵ = 100,000. But the Answer says 50x.
Let me correct: pH difference of 5 means 10⁵ = 100,000 times stronger. But the file says 50x. I'll
correct to 100,000x.
Answer: 100,000x stronger
Rationale: pH 4 has 10⁻⁴ M H⁺; pH 9 has 10⁻⁹ M H⁺. Difference is 10⁵ = 100,000 times.
8. Base Pair Nucleotides with double strand of DNA
A) Purines: A, G; Pyrimidines: C, T
B) Purines: adenine (A), guanine (G), pyrimidines: cytosine (C), thymine (T)
C) Purines: C, T; Pyrimidines: A, G
D) Purines: A, T; Pyrimidines: G, C
Answer B: Purines: adenine (A), guanine (G), pyrimidines: cytosine (C), thymine (T)
Rationale: Adenine pairs with thymine (2 H-bonds); guanine pairs with cytosine (3 H-bonds).
9. Pulmonary circuit
A) Oxygenated blood away from left ventricle
B) Deoxygenated blood away from the right ventricle, to the lungs, and returns oxygenated blood
to the left atrium and ventricle of the heart
Correct Answers | Latest Update A+ | Complete
TEAS 7 Exam Prep
1. What cell is similar to T cells?
A) B cells
B) Killer cells
C) Helper cells
D) Memory cells
Answer B: Killer cells
Rationale: Killer (cytotoxic) T cells directly attack infected or cancerous cells. They are a type of
T cell.
2. What hormone responds to stress?
A) Aldosterone
B) Cortisol
C) Insulin
D) Thyroxine
Answer B: Cortisol
Rationale: Cortisol is the primary stress hormone, released by the adrenal cortex to increase
glucose and blood pressure.
3. What hormone helps to regulate sodium?
A) Cortisol
B) Aldosterone
C) ADH
D) Insulin
Answer B: Aldosterone
Rationale: Aldosterone (from adrenal cortex) increases sodium reabsorption and potassium
excretion in the kidneys.
4. What skin layer contains dead cells?
A) Stratum basale
B) Stratum spinosum
C) Stratum corneum
D) Stratum granulosum
Answer C: Stratum corneum
Rationale: The stratum corneum is the outermost layer of the epidermis, composed of dead,
keratinized cells.
, 5. Why is the cell in a hypertonic solution?
A) Water moves into the cell
B) Water moves out of the cell / lower water concentration
C) Solutes move out of the cell
D) No water movement
Answer B: Water moves out of the cell / lower water concentration
Rationale: In a hypertonic solution, solute concentration outside is higher, so water leaves the
cell by osmosis.
6. What releases sodium bicarbonate?
A) Liver
B) Pancreas
C) Stomach
D) Kidneys
Answer B: Pancreas
Rationale: The pancreas releases sodium bicarbonate to neutralize stomach acid in the
duodenum.
7. pH 4 to pH 9 is how many times stronger?
A) 5x
B) 10x
C) 50x
D) 100x
Answer C: 50x
Rationale: pH 4 is 10⁻⁴ M H⁺; pH 9 is 10⁻⁹ M H⁺. The difference is 10⁵ = 100,000? Actually, 10⁻⁴ is
100,000 times stronger than 10⁻⁹? Wait: 10⁻⁴ / 10⁻⁹ = 10⁵ = 100,000. But the Answer says 50x.
Let me correct: pH difference of 5 means 10⁵ = 100,000 times stronger. But the file says 50x. I'll
correct to 100,000x.
Answer: 100,000x stronger
Rationale: pH 4 has 10⁻⁴ M H⁺; pH 9 has 10⁻⁹ M H⁺. Difference is 10⁵ = 100,000 times.
8. Base Pair Nucleotides with double strand of DNA
A) Purines: A, G; Pyrimidines: C, T
B) Purines: adenine (A), guanine (G), pyrimidines: cytosine (C), thymine (T)
C) Purines: C, T; Pyrimidines: A, G
D) Purines: A, T; Pyrimidines: G, C
Answer B: Purines: adenine (A), guanine (G), pyrimidines: cytosine (C), thymine (T)
Rationale: Adenine pairs with thymine (2 H-bonds); guanine pairs with cytosine (3 H-bonds).
9. Pulmonary circuit
A) Oxygenated blood away from left ventricle
B) Deoxygenated blood away from the right ventricle, to the lungs, and returns oxygenated blood
to the left atrium and ventricle of the heart
