BIOL 110 Study Guide - Midterm Guide: Hydrogen Atom, Covalent Bond, Archaea

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The scientific method consists of a series of steps; Bacteria and archaea have prokaryotic cells- (does not have a nucleus) Bacteria has four basic components: plasma membrane, ribosomes, cytoplasma, dna. Molecules and atoms organelles cells tissues organs and organ systems . Organisms populations communities ecosystems biospheres. Carbon, hydrogen, oxygen, and nitrogen make up 96% of living matter. The remaining 4% consists of calcium, phosphorous, potassium, and sulfur. Electrons- negative charge; found in the orbital 90% of the time. Neutron mass and proton mass are almost identical and are measured in daltons. Atomic number- is the number of protons in the nucleus. Mass number- the sum of protons plus neutrons in the nucleus. Atomic mass- the atom"s total mass, can be approximated by the mass number. Isotopes are two atoms of an element that differ in number of neutrons. Radioactive isotopes- decay spontaneously, giving off particles and energy some applications of radioactive isotopes in biological research are:

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