Bio 101 NVCC Exam 1 CORRECT QUESTIONS AND VERIFIED DETAILED RATIONALES ANSWERS 2024

Bio 101 NVCC Exam 1 CORRECT QUESTIONS AND VERIFIED DETAILED RATIONALES ANSWERS 2024 Matter Answer organisms are composed of matter Element Answer - A substance that cannot be broken down to other substances by chemical reactions - Oxygen, carbon, and hydrogen make up 96.3% of the body - An element's properties depend on the structure of its atoms Compound Answer A substance consisting of two or more elements in a fixed ratio Trace elements Answer required by an organism in only minute quantities Atoms Answer the smallest unit of matter that still contains properties of an element Protons Answer - Positively charged particles - The negative and positive protons hold the atom together - # of protons = # of neutrons = # of electrons Neutrons Answer the particles of the nucleus that have no charge Electrons Answer Negatively charged particles atomic number Answer the number of protons in an atom mass number Answer the sum of the number of neutrons and protons in an atomic nucleus Isotopes Answer - Atoms of the same element that have different numbers of neutrons - Used for dating fossils, tracking atoms through metabolic processes, and diagnosing medical disorders radioactive isotope Answer An isotope whose nucleus decays spontaneously, giving off particles and energy.