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ATI TEAS Version 7 – Science. July 2026

Question 1

During a study of various animals, researchers measured the brain-to-body mass ratio to evaluate cognitive abilities across species. The table shows the ratios measured for several species. Which of the following animals has the largest brain mass compared to its body mass?

• Cannot be determined  ATI TEAS Version 7 – Science. July 2026

• Dolphin

• Human

• Elephant

Question 2

An example of active immunity is the transfer of

• antigens through vaccination.

• antibodies through the placenta.

• immune cells through a blood transfusion.

• immunoglobulins through breastfeeding.

Question 3

Benzene has a density of 0.88 g/mL while water has a density of 1.00 g/mL. They are immiscible with each other. If they are stirred together and allowed to rest, which of the following statements would be true?

• “An equal amount of water and benzene will show a layered product with water on top.”

• “An equal amount of water and benzene will fully mix together and show no layers.”

• “An equal amount of water and benzene will show multiple alternating layers.”

• “An equal amount of water and benzene will show a layered product with benzene on top.”

Question 4

Which of the following explains the results of a Gram stain?

• Gram-negative bacteria contain a thick peptidoglycan layer and stain green.

• Gram-positive bacteria contain a thick glycocalyx layer and stain red.

• Gram-negative bacteria contain a thick glycocalyx layer and stain blue.

• Gram-positive bacteria contain a thick peptidoglycan layer and stain purple.

Question 5

Which of the following statements is a testable hypothesis?

• There is a special kind of light that is completely undetectable.

• Coffee is a better morning drink than tea.

• Walking 3 miles per day will lower average blood pressure.

• If the sun were red, human life expectancy would increase.

Question 9

Which of the following occurs as a result of acetylcholine being released into the neuromuscular synapse?

• Chemically gated calcium channels on the sarcolemma are opened by acetylcholine.

• Receptor proteins are secreted from the sarcolemma.

• Sodium ions are released into the neuromuscular synapse.

• An action potential is generated along the sarcolemma of the muscle fiber.

Question 10

Which of the following correctly identifies the hormone and secretory cells that are responsible for lowering blood glucose levels?

• Insulin secreted by β cells

• Insulin secreted by α cells

• Glucagon secreted by β cells

• Glucagon secreted by α cells

Question 11

Which of the following microscopes would be used to produce the following image of a blood clot?

• Compound light microscope

• Stereoscope

• Scanning electron microscope

• Transmission electron microscope