Atoms that gain electrons become negatively charged.

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons.

An element is a substance whose atoms all contain the same number of neutrons.

Temperature has no effect on diffusion rate.

The two purine nitrogen bases are adenine and guanine.

The ____ structure of proteins is determined by the hydrogen bonds between amino acids that cause the protein to coil into helices or pleated sheets.

A solution with a pH of 3 is called a(n) ____.

What kind of bond is formed when two atoms share electrons?

Elements or molecules contributing electrons during a reaction are called ____.

The type of transport that requires energy input is called ____.

A red blood cell that is placed in a hypotonic solution will ____.

The covalent bonds that are formed between different amino acids to form a protein are known as ____.

Molecules containing which type of bond do not dissociate in water?

The basic building blocks of proteins are ____.

A(n) ____ molecule is a double-stranded helical chain made up of nucleotides.