Human anatomy, biology, chemistry, and scientific reasoning
Science is the largest and often toughest section of the ATI TEAS 7, so practicing real TEAS science questions is essential. Below you’ll find free TEAS science practice questions with answers and explanations — weighted toward anatomy and physiology, since A&P is roughly 40% of the section — followed by study guides for every science topic. The section has 50 questions (44 scored) and a 60-minute limit, so work through these TEAS science questions with answers to build both accuracy and speed.
Pick a topic to study, or scroll down to try a few sample questions.
A quick taste of real, exam-style TEAS science questions. Tap “Show answer” to reveal the correct choice and a full explanation.
Q1What are the monomer (building-block) units of nucleic acids such as DNA and RNA?
Answer: Nucleotides
Why: Nucleic acids (DNA and RNA) are polymers built from nucleotide monomers. Amino acids build proteins, monosaccharides build carbohydrates, and fatty acids are components of many lipids.
Q2Which accessory organ produces enzymes that digest carbohydrates, proteins, and fats and also secretes bicarbonate to neutralize stomach acid entering the small intestine?
Answer: Pancreas
Why: The pancreas secretes digestive enzymes (amylase, proteases such as trypsin, and lipase) plus bicarbonate that neutralizes the acidic chyme from the stomach. The liver makes bile, the gallbladder stores bile, and the spleen is not a digestive organ.
Q3After mRNA is made, protein synthesis (translation) is carried out at which cell structure?
Answer: The ribosome
Why: Translation—assembling amino acids into a protein according to the mRNA codons—occurs at the ribosome. Transcription (making mRNA from DNA) happens in the nucleus, but the mRNA then travels to a ribosome in the cytoplasm for translation.
Q4On an mRNA molecule, how many nitrogenous bases make up a single codon, a three-base unit that usually specifies an amino acid (or signals stop)?
Answer: Three
Why: A codon is a sequence of three consecutive mRNA bases (e.g., AUG). Each three-base codon specifies one amino acid (or a start/stop signal) during translation.
Q5Which large phagocytic white blood cells engulf and digest pathogens and also present antigens to help activate the adaptive immune response?
Answer: Macrophages
Why: Macrophages are large phagocytes that engulf pathogens and cellular debris and then present antigens to T cells, linking innate and adaptive immunity. Red blood cells carry oxygen, platelets aid clotting, and osteoclasts break down bone.
TEAS 7 science has 44 scored questions across these reporting categories:
Because anatomy and physiology dominate the section, front-load your practice there. Use the free science questions below to find weak body systems, then read the explanations closely — TEAS science rewards recognizing structures, functions, and cause-and-effect relationships.