BIOLOGY 101: Biochemical Basics Flashcards actual exam latest version questions and accurate answers verified 2024-2025 A chemical substance that cannot be broken down further using standard chemical techniques is known as: A An element For example, carbon (C) is an element. Atoms of a particular element always have the same number of protons. For example, all carbon atoms have 6 protons! 13 Q What is the difference between an atom, a molecule, and a compound? A An atom is the fundamental unit of matter. Atoms contain protons, neutrons, and electrons. A molecule is a group of two or more atoms, connected by chemical bonds (for example, O2). A compound is a molecule that contains atoms of more than one element (for example, H2O).14 Q Which of the following are contained within the nucleus of a typical atom? Protons Neutrons Electrons A A typical atomic nucleus contains protons and neutrons. Electrons are not found in the nucleus; instead, they are located in regions (shells) surrounding the nucleus. 15 Q Isotopes are atoms with the same number of: A protons Isotopes are atoms with the same number of protons, meaning that they must represent the same element. Isotopes differ in their number