ATOMS & BONDS
WATER, pH & SOLUTIONS
DNA & BASE PAIRING
PROTEINS & ENZYMES
CHEMICAL REACTIONS & BIO
100
What is the atomic number?
This number tells you how many protons are in an atom.
100
What is the pH scale?
This scale measures how acidic or basic a substance is.
100
What is complementary base pairing?
The specific, hydrogen-bonded pairing of nitrogenous bases in DNA and RNA, where adenine (A) pairs with thymine (T)—or uracil (U) in RNA—and guanine (G) pairs with cytosine (C).
100
What are amino acids?
The building blocks (monomers) of proteins.
Monomers are small, basic molecular building blocks. 
100
What are reactants?
These are the starting substances in a chemical reaction.
200
What is a covalent bond?
This bond forms when electrons are shared between atoms.
200
What is 7 on the scale?
On the pH scale, this number is considered neutral.
200
What are purines?
Adenine and Guanine belong to this structural group.
200
What is primary structure?
The sequence of amino acids in a protein is called this level of structure.
200
What are products?
These are formed at the end of a chemical reaction. 
300
What is an ionic bond?
This bond forms when electrons are transferred between atoms.
300
What is the solute?
In a solution, this substance is being dissolved.
300
What are pyrimidines?
Cytosine, Thymine, and Uracil belong to this structural group.
300
What is denatured?
When a protein loses its shape due to heat or pH change, it becomes this.
300
What is a polypeptide?
A long chain of amino acids is called this.
400
What is neutral charge?
An atom with equal protons and electrons has this type of charge.
400
What is ice floating?
Water is less dense as a solid than a liquid, which explains this phenomenon.
400
What is the Central Dogma?
This describes the flow of genetic information from DNA to RNA to Protein.
400
What is the substrate?
This molecule binds to an enzyme at the active site.
400
What are oligopeptides?
Short chains of amino acids are called this.
500
What are orbitals (or electron shells)?
These regions around the nucleus describe where electrons are most likely found.
500
What are buffers?
These substances resist changes in pH.
500
What is DNA?
These molecules make up chromosomes along with proteins.
500
What is sickle cell disease?
A single amino acid substitution in hemoglobin alters folding and changes the overall shape of red blood cells.
500
What are allele frequencies?
Natural selection causes changes in this over time within a population.