BIO 181 NAU- Exam 1 with 100% correct answers

BIO 181 NAU- Exam 1Matter - correct answer Anything that occupies space and has a mass Three Physical States of Matter - correct answer Solid, liquid, gas Element - correct answer Substance that cannot be broken down into other substances by chemical reactions Four elements that make up about 96% of the weight and most cells: - correct answer Oxygen, carbon, hydrogen, nitrogen Atoms - correct answer The smallest functional units of matter that form ALL chemical substances Three subatomic particles - correct answer Protons, Neutrons, Electrons Protons - correct answer Positive charge, found in nucleus. Number of protons is what distinguishes one element from another Atomic number - correct answer How many protons are in an element Mass number - correct answer sum of the number of protons and neutrons in its nucleus