C190 - Introduction to Biology WGU - Unit 2: Modules 4-10 Questions and Answers Solved Correctly

Biological macromolecules are: - special molecules that contain carbon atoms covalently bonded with hydrogen atoms Atoms are made of small subatomic particles called: -protons, neutrons, and electrons Proton electrical charge: -positive Neutron electrical charge: - neutral, neither positive nor negative The nucleus has what kind of charge? - a positive overall charge since the protons are in it with the neutrons Protons and neutrons have a mass of what? - 1 atomic mass unit (amu) Electron electrical charge: - negative Electrons are found where? - outside of the nucleus in the "shells" Electron has a mass of what? - nearly nothing, negligible 0 amu When the number of protons equals the number of electrons, then the atom is: - electrically neutral If the number of protons differs from the number of electrons, then the atom has an: - electrical chargeAn atom with more or less protons than electrons is called an: - ion The atomic mass is the sum of: - the number of protons and the number of neutrons Two or more atoms combine to form a larger and more complex entity called a: - molecule There are three types of chemical bonds that are important in biology: - covalent bonds, ionic bonds, and hydrogen bonds. Covalent bond properties: - strongest, occurs between atoms in the same molecule, electron pairs are shared, creating a strong bond between atoms Ionic bond properties: - moderate strength, occurs between atoms in the same molecule (i.e., between the ions), electrons transfer from one atom to another, resulting in a moderately strong electrostatic attraction between oppositely charged ions