TEAS Science Practice Question

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Sample questions from TEAS Science Practice Question

This material has 90 questions with answers and rationales. Here are the first 5.

1. 1.Which organelle is the primary site of aerobic cellular respiration?

   • A.Ribosome
   • B.Mitochondrion
   • C.Golgi apparatus
   • D.Lysosome

   Rationale: Mitochondria generate most of a cell's ATP through aerobic respiration. Ribosomes make proteins, the Golgi apparatus modifies and packages cell products, and lysosomes digest cellular material. Remember that mitochondria are the main ATP-producing organelles.

2. 2.Which structure carries oxygen-rich blood from the lungs to the heart?

   • A.Pulmonary artery
   • B.Vena cava
   • C.Pulmonary vein
   • D.Aorta

   Rationale: Pulmonary veins carry oxygenated blood from the lungs into the left atrium. The pulmonary artery carries blood toward the lungs, the vena cava returns blood from the body, and the aorta carries blood from the heart to the body. The pulmonary vessels are exceptions to the usual oxygenation pattern of arteries and veins.

3. 3.Which part of the nephron filters blood to form the initial filtrate?

   • A.Glomerulus
   • B.Loop of Henle
   • C.Collecting duct
   • D.Distal convoluted tubule

   Rationale: The glomerulus filters water and small solutes from blood into the nephron. The loop of Henle and distal tubule adjust filtrate composition, while the collecting duct carries the final urine onward. Filtration begins in the glomerulus.

4. 4.Which hormone lowers blood glucose by promoting its uptake into cells?

   • A.Glucagon
   • B.Insulin
   • C.Thyroxine
   • D.Cortisol

   Answer and rationale are in the full material.

5. 5.Which type of blood cell is primarily responsible for producing antibodies?

   • A.Erythrocyte
   • B.Platelet
   • C.B lymphocyte
   • D.Neutrophil

   Answer and rationale are in the full material.