Hesi A2 Biology - Basics, Water, and Molecules Questions and Answers | Latest Version | 2025/2026 | Correct & Verified

Hesi A2 Biology - Basics, Water, and Molecules Questions and Answers | Latest Version | 2025/2026 | Correct & Verified What is the main function of enzymes in biological systems? They speed up chemical reactions by lowering activation energy. Why is water considered a polar molecule? Because it has a partial positive charge on hydrogen and a partial negative charge on oxygen. What property of water allows it to move upward in plant stems through capillary action? Cohesion and adhesion. What is the primary building block of proteins? Amino acids. Which molecule is the main source of quick energy for cells? Glucose. 2 Why does ice float on liquid water? Because ice has a lower density due to hydrogen bond spacing. What type of bond forms between two water molecules? Hydrogen bond. What is the universal solvent in biology? Water. What type of macromolecule stores genetic information? Nucleic acids. What elements are found in carbohydrates? Carbon, hydrogen, and oxygen. Which property of water helps regulate Earth’s climate? High specific heat capacity. 3 What is the main function of lipids in the body? Long-term energy storage and insulation. What type of reaction joins two monomers together? Dehydration synthesis. What type of reaction breaks polymers into monomers? Hydrolysis. Why is carbon considered the backbone of life? Because it can form four covalent bonds, creating diverse molecules. What is the function of DNA in cells? It stores genetic information. What type of carbohydrate is sucrose? A disaccharide.