90 original TEAS 7-style science practice questions, each with a full rationale, distractor analysis, and study tips. Use these to drill the exact concepts the ATI TEAS tests — then jump into a timed quiz when you're ready.
Open any question to check the correct answer and a concise explanation. Each question also links to a dedicated study page with a full rationale and study tip.
Which organelle produces most of a cell's ATP during aerobic respiration?
Answer: B. Mitochondrion
Mitochondria use the citric acid cycle and electron transport chain to produce most cellular ATP.
Read the full explanationWhich chamber pumps oxygenated blood into the systemic circulation?
Answer: D. Left ventricle
The left ventricle contracts to send oxygenated blood through the aorta to the body.
Read the full explanationWhere does most gas exchange occur in the lungs?
Answer: C. Alveoli
Thin alveolar walls and surrounding capillaries permit rapid diffusion of oxygen and carbon dioxide.
Read the full explanationWhat is the functional unit of the kidney?
Answer: B. Nephron
Each nephron filters blood and modifies the filtrate to form urine.
Read the full explanationWhich hormone lowers blood glucose after a meal?
Answer: C. Insulin
Insulin promotes glucose uptake and storage, reducing the glucose concentration in blood.
Read the full explanationIf two heterozygous parents have genotype Aa, what is the probability that an offspring will have genotype aa?
Answer: B. 25%
A Punnett square for Aa × Aa produces AA, Aa, Aa, and aa, so one of four outcomes is aa.
Read the full explanationWhich process moves water across a selectively permeable membrane?
Answer: A. Osmosis
Osmosis is the passive movement of water across a selectively permeable membrane.
Read the full explanationWhich cells produce antibodies during an adaptive immune response?
Answer: B. Plasma cells
Activated B lymphocytes differentiate into plasma cells that secrete antibodies.
Read the full explanationWhich type of joint permits the greatest range of motion?
Answer: C. Ball-and-socket
Ball-and-socket joints, such as the shoulder and hip, permit movement in multiple planes.
Read the full explanationMost nutrient absorption occurs in which organ?
Answer: B. Small intestine
Villi and microvilli give the small intestine a large surface area for nutrient absorption.
Read the full explanationUse these focused guides to review the concepts behind the questions, then return to this bank for more practice.
Review anatomy, biology, chemistry, and scientific reasoning.
Practice body-system questions with detailed rationales.
Strengthen recall across major science concepts.
Review high-yield science facts and relationships.
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