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.
The involuntary rhythmic contractions used to move a bolus of food through the esophagus are primarily performed by which type of muscle tissue?
Answer: B. Smooth muscle
Smooth muscle is responsible for involuntary movements like peristalsis in the esophagus and the rest of the digestive tract.
Read the full explanationWithin the human eye, which light-sensitive pigment derived from Vitamin A combines with the protein opsin to form rhodopsin in the rod cells?
Answer: B. Retinal
Retinal is the light-absorbing pigment that combines with opsin to form rhodopsin, the primary chemical required for low-light vision in rod cells.
Read the full explanationIn a developing nation characterized by high infant mortality rates and a rapidly expanding overall population, which of the following demographic trends is most likely to be observed?
Answer: C. The birth rate significantly exceeds the death rate.
A growing population requires the birth rate to be higher than the death rate, even if infant mortality is high.
Read the full explanationWhich of the following types of cells is classified as a leukocyte?
Answer: B. Lymphocytes
Lymphocytes are one of the five main types of leukocytes (white blood cells) responsible for the body's immune response.
Read the full explanationWhen examining a single nucleotide unit of DNA or RNA, which chemical subunit dictates its classification as either a purine or a pyrimidine?
Answer: C. The nitrogenous base
The nitrogenous base determines if a nucleotide is a purine (double-ring) or pyrimidine (single-ring). Learn the difference for the TEAS.
Read the full explanationA student examining an unknown cell under a high-powered microscope identifies several structures. Which of the following organelles or structures would be found in both a prokaryotic cell (like a bacterium) and a eukaryotic cell (like a human skin cell)?
Answer: C. Ribosomes
Ribosomes are found in both prokaryotic and eukaryotic cells because all living cells require proteins to function.
Read the full explanationA botanist analyzes the nutrient composition of seeds harvested from two groups of sunflowers grown in different soil mixtures. The data shows that seeds from Group 1 have a significantly higher protein content by mass compared to seeds from Group 2. Which of the following is a logical inference based on this data?
Answer: B. Group 1 seeds contained higher concentrations of amino acids than Group 2 seeds.
High protein levels directly correlate to higher concentrations of amino acids, which are the fundamental building blocks of proteins.
Read the full explanationIn a skeletal muscle cell, which specialized organelle acts as a reservoir for calcium ions (Ca²⁺) and is responsible for flooding the cytoplasm with these ions to stimulate a contraction?
Answer: B. Sarcoplasmic reticulum
The Sarcoplasmic Reticulum (SR) is the specialized muscle organelle that stores and releases calcium ions to initiate muscle contraction.
Read the full explanationIn the nervous system, the specialized junction where a chemical signal or electrical impulse is passed from a neuron to another cell is known as the:
Answer: B. Synapse
The synapse is the specialized junction where neurotransmitters are released to transfer a nerve impulse to a target cell.
Read the full explanationWhich of the following serves as an example of a genotype?
Answer: B. A heterozygous allelic pair
A genotype represents the genetic makeup of an organism, such as a heterozygous allelic pair, rather than its visible physical traits.
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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