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.
What usually happens to an enzyme exposed to a temperature far above its optimum?
Answer: B. It is denatured
Excessive heat can disrupt the enzyme's three-dimensional shape and reduce its activity.
Read the full explanationWhich blood component is primarily responsible for clot formation?
Answer: A. Platelets
Platelets aggregate at damaged vessels and help activate the clotting cascade.
Read the full explanationWhat term describes different forms of the same gene?
Answer: A. Alleles
Alleles are alternative versions of a gene found at the same locus on homologous chromosomes.
Read the full explanationWhich change is a physical change rather than a chemical change?
Answer: C. Ice melting
Melting changes water's state but does not change its chemical identity.
Read the full explanationWhy is a control group used in an experiment?
Answer: B. To provide a comparison baseline
A control group provides a baseline against which the effect of the tested condition can be compared.
Read the full explanationWhich skin layer contains most blood vessels, sensory receptors, and sweat glands?
Answer: B. Dermis
The dermis is the vascular connective-tissue layer that houses receptors, glands, follicles, and blood vessels.
Read the full explanationWhat is a primary function of lymph nodes?
Answer: B. Filter lymph and support immune responses
Lymph nodes filter lymph and provide sites where immune cells encounter and respond to foreign material.
Read the full explanationDuring which phase of mitosis do sister chromatids separate?
Answer: C. Anaphase
During anaphase, spindle fibers pull sister chromatids toward opposite poles of the cell.
Read the full explanationWhich process uses an mRNA sequence to assemble amino acids into a protein?
Answer: B. Translation
Ribosomes translate mRNA codons into an amino-acid sequence with help from tRNA.
Read the full explanationWhich class of biological molecule includes enzymes?
Answer: C. Proteins
Most enzymes are proteins whose three-dimensional shapes allow them to catalyze reactions.
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.
Our full TEAS Science bank has hundreds more questions with timed mode, mark-for-review, and detailed score reports.
Start free practice