Definitions
Isotope
These particles are found in the nucleus of an atom.
Protons and Neutrons
the 20 amino acids vary only in this group
This holds DNA's double helix together between the bases
Hydrogen bonding
Ph 7
Neutral or pure water
an attractive force that holds molecules of the same substance together
Has a different number of protons and electrons
Ion
a specific reactant an enzyme acts upon
substrate
The Nitrogenous (or nucleotide) base
This happens when two atoms share a pair of electrons.
covalent bond
a lipid made from fatty acids that have no double bonds between carbon bonds
Saturated fat
must have the same number of protons and as electrons
Atoms
this lowers the activation energy of a reaction
enzyme
The building blocks of DNA and RNA
Nucleotides
lower density of ice compared to liquid water is a result of
Hydrogen bonding
The energy needed to get reactions started
Activation energy
tells you the total number of neutrons and protons in the nucleus
Th properties of a protein are determined by the type, # and order of ____ ____ _______ _______
Amino acids linked together
is a lipid molecule with four fused carbon rings
steroid
a solution with a pH of 5
acidic
Two different molecules that have the same chemical formula
electron
The process in which the normal shape of a protein is lost
Denaturation
adenine is to thymine as Guanine is to ______
Cytosine
Th breaking down complex molecules by the chemical addition of water
Hydrolysis