Anatomy and Physiology Atoms, Ions, and Molecules

True or false: Lipids are polymers.

False. Carbohydrates, proteins and nucleic acids are polymers. Lipids are not. Polymers are repeating units of monomers. Lipids are not made up of repeating units of monomers.

covalent bond

A type of strong chemical bond in which two atoms share one or more pairs of valence electrons.

Amino acids are linked ______ by ______ bonds

covalently, peptide

cations

Ions with a positive charge

four most common elements of the human body.

Oxygen, Hydrogen, Carbon, Nitrogen

Atoms with a positive or negative charge are called ______.

ions

Isotopes

same number of protons and electrons, different number of neutrons. (different atoms of the same element)

radioisotopes

unstable, have an excess amount of neutrons. Can trace products of breaking down action, can help locate a nodule

isomers

molecules with the same number and kind of elements arranged differently in space

polar bonds

electrons are not evenly distributed

non-polar bonds

electrons are evenly distributed

Acids

ph less than 7

bases

ph greater than 7

H+>OH-

acid

H+<OH-

base