2023 HESI A2 BIOLOGY EXAM PREP Q&A

2023 HESI A2 BIOLOGY EXAM PREP Q&A 1. 1. QUESTION A clinical researcher administered a pill with no therapeutic value to his subject. Which of the following best describes this treatment? o Experimentation o Placebo o Evaluation o Double-blind A placebo prevents the test subjects from knowing whether they are being given the real therapeutic drug or not. This helps the examiner understand the true effects of the drug. Experimentation involves a set of procedures used to test a particular hypothesis. Double-blind keeps the identity of subjects hidden from the researcher to avoid any researcherpatient bias in the experiments. Evaluation involves analyzing the results of experiments and drawing valid, scientific conclusions from them. 2. 2. QUESTION Bony fishes belong to Phylum Chordata. Which of the following levels of classification is more inclusive than this level? o Order o Class o Kingdom o Family Kingdom is a higher or more inclusive level of the hierarchical system of classification than the phylum level. Living organisms are classified from most inclusive to least inclusive: o Domain o Kingdom o Phylum o Class o Order o Family o Genus o Species 3. 3. QUESTION Which of these defines specific heat? o The amount of heat needed to reduce the temperature of one gram of a substance by one degree celsius o The amount of heat needed to raise the temperature of one gram of a substance by one degree celsius o The amount of heat needed to reduce the temperature of one kilogram of a substance by one degree celsius o The amount of heat needed to raise the temperature of one kilogram of a substance by one degree celsius The amount of heat needed to raise the temperature of one gram of a substance by one degree celsius is called specific heat. The unit of specific heat is joules per gram per degree (J/g°C). 4. 4. QUESTION Polarity allows water to be a good __________. o solvent o solute o solution o molecule Polarity allows water to be a good solvent and other polar substances can