HESI A2 BIOLOGY 2023 VERIFIED COMPLETE QUESTIONS AND ANSWERS

1. Hierarchic Organizational system for nomenclature: Kingdom Phylum Class Order Family Genus Species (Least) "Keep Penguins Cool Or Find Good Shelter" 2. Scientific Method: Observation Hypothesis Experiment Conclusion 3. Water: All life, and therefore biology , occurs in water. 4. Properties of Water: 2 Hydrogen bonds Covalently bonded to Oxygen. Hydrogen Bonding between molecules. - High specific heat - Large bodies or water stabilize climates - Strong cohesive and adhesive properties - Water freezes forms a lattice crystal resulting in ice floating in water. - Polarity of water allows it to act as a universal solvent. - Water can be used to dissolve different solvents. 5. Carbohydrates: Long chains, or polymers of sugar. Most importantly form the backbone of DNA and RNA. 6. Saturated: Clogs arteries. NO DOUBLE BONDS in their hydrocarbon tail. SOL- ID @ room temperature. 7. Unsaturated: Double bond in their hydrocarbon tail. LIQUID at room tempera- ture. 8. Phospholipids: Phosphate group (polar) soluble in water. Hydro fatty acids is nonpolar and nonsoluble in water. Ex. Cell Membrane 9. Steroids: Are lipids, which are precursors to hormones and drugs 10. Proteins: They are Polymers of 20 molecules called Amino Acids. Enzymes are a type of protein, which catalyze different reactions or processes. LARGEST Biological Molecule