5 Written questions
5 Matching questions
- polar molecule
- amino acid
- nucleic acid
- a protein that speeds up a biological reaction by lowering the activation energy needed to start the reaction
- b complex macromolecule that stores and communicates genetic information.
- c measure of the concentration of hydrogen ions (H+) in a solution.
- d molecule with oppositely charged regions
- e carbon compound joined by peptide bonds; building block of proteins.
5 Multiple choice questions
- center of an atom; contains neutrons and protons. In eukaryotic cells, the central membrane-bound organelle that manages cellular functions and contains DNA
- large molecule formed from smaller repeating units or identical, or nearly identical, compounds linked by covalent bonds.
- type of chemical bond formed when atoms share electrons.
- substance in which another substance is dissolved.
- particle without a charge in an atom's nucleus
5 True/False questions
compound → pure substance with unique properties; formed when two or more different elements combine.
solute → homogeneous mixture formed when a substance (the solute) is dissolved in another substance (the solvent).
mixture → combination of two or more different substances in which each substance keeps its individual characteristics; can have a uniform composition (homogeneous) or have distinct areas of substances (heterogeneous).
buffer → substance that releases hydroxide ions (OH-) when dissolved in water; a basic solution has a pH greater than 7.
isotope → positively charged particle in an atom's nucleus.