Articles > Chemical Composition of the Body – Quiz Chemical Composition of the Body – Quiz Quiz Choose the best answer. 1. Which of the following is TRUE about an atom? An atom is the smallest unit of matter having identical chemical properties. An atom consist of a nucleus that orbits around the central electron. In an atom, a proton carries a positive charge whereas a neutron carries a negative charge. Atomic number refers to the number of protons in an atom. 2. Which is TRUE about an ionic bond? It forms between two positively charged ions. It forms between two negatively charged ions. It forms between two oppositely charged ions. It forms when electrons in the outer orbit are shared between two atoms. 3. Carbon has four electrons in its outer orbit that it can share with another atom through a chemical bond called __________? Covalent bond Ionic bond Hydrogen bond All of the above 4. The most common molecule in the human body is _____________? Water Oxygen Carbon dioxide Glucose 5. The biomolecule that stores, transmits, express genetic information is _____________? Carbohydrate Lipid Protein Nucleic acid Send Your Results (Optional) Your Name To Email Time is Up!