HESI A2 Biology case studies
HESI A2 Biology · Put your knowledge to work in context.
The HESI A2 Admission Assessment is a standardized entrance exam used by many nursing and health-professions programs as one part of their admissions review. The Biology section is one of the subject-area tests within that assessment, and it is typically taken alongside other sections such as reading comprehension, vocabulary, grammar, math, and anatomy and physiology, though which sections a given school requires is set by that school rather than by the exam publisher. The HESI A2 Biology case studies are 5 cases and about 2,778 words.
1Catalase in Potato Extract: Denaturation or Just Slowing?
A student grinds 20 g of fresh potato, filters the extract through cheesecloth, and keeps it on ice. For each trial she adds 1 mL of extract to a tube containing 5 mL of 3% hydrogen peroxide held at the stated temperature and counts the oxygen bubbles collected in an inverted graduated tube over two minutes.
605 words, about 3 min2ABO and Rh Counseling for a Second Pregnancy
A couple is referred to a genetics clinic during the woman's second pregnancy, at 10 weeks. The woman is blood type A, Rh-negative; her mother was type O.
567 words, about 3 min3Dialysis Bags, Osmosis, and an Enzyme That Cannot Get In
A student fills four dialysis bags (molecular weight cutoff 12,000 Da) with 10 mL of solution, ties them, weighs each, and suspends each in a separate beaker containing 100 mL of test solution at room temperature. After 60 minutes each bag is blotted and reweighed, and the beaker fluid is tested with Benedict's reagent for glucose and with iodine for starch.
549 words, about 3 min4A Sealed Chamber: Separating Photosynthesis from Respiration
A student seals a healthy sprig of Elodea in a 2 L clear chamber fitted with a CO2 monitor and a controllable light bank. Temperature is held at 25 °C throughout.
534 words, about 3 min5Two Anticancer Drugs and Two Very Different Arrests
Three flasks of human cells (46 chromosomes in G1) are grown in identical medium. Flask 1, untreated: mitotic index 4%.
523 words, about 3 min