HESI A2 Exam Biology 2024 Questions with Correct Answers

HESI A2 Exam Biology 2024 Questions with Correct Answers 1. what is the hierarchic organizational system for nomenclature? kingdom, phylum, class, order, family, genus, species 2. what are the steps of the scientific method? observation, hypothesis, experiment, conclusion 3. what is the chemical composition of water? two hydrogen atoms covalently bonded to an oxygen atom 4. what is the most significant aspect of water? polarity of its bond 5. what does water's polarity allow for? hydrogen bonding and versatile solvent 6. what does hydrogen bonding in water cause? high specific heat value, strong cohesive and strong adhesive properties 7. what is the definition of specific heat? the amount of heat necessary to raise the temperature of one gram of that molecule by one degree Celsius 8. what is good to note about water's specific heat value? it is relatively high 9. what does a relatively high specific heat value allow for? resists shifts in temperature 10. how does the high specific heat value of water play a role in the biosphere? oceans and large bodies of water are able to stabilize climates 11. what is cohesion? the ability of a molecule to stay bonded or attracted to another molecule of the same substance 12. what is adhesion? the ability of a molecule to bond or attract other molecules or substances 13. what occurs when water freezes? lattice crystal is formed, molecules spread apart 14. what are the most important biological molecules? carbohydrates, lipids, proteins, nucleic acids 15. what are carbohydrates? generally long chains or polymers of sugars 16. what are the most important functions of carbohydrates? storage, structure, energy 17. what is DNA short for? dioxyribonucleic acid 18. what is RNA short for? ribonucleic acid 19. what forms the backbone of DNA and RNA? sugar-phosphate backbone