Term | Definition |
cell theory | all living things are made of cells, cells are the basic unit of life, cells come from preexisting cells |
lysosomes | acts as the garbage disposal, using enzymes to break down wastes in the cell |
facilitated diffusion | movement across the plasma membrane from an area of higher concentration to an area of lower concentration with the help of a carrier molecule, energy is not required |
inference | a logical interpretation based on prior knowledge and experience |
semi-permeable | allows some substances to pass across it while others cannot (cell membrane) |
eukaryotic | organism whose cells contain a nucleus |
prokaryotic | unicellular organism that lacks a nucleus |
mitochondria | converts energy stored in food into compounds that the cell can use |
protein | macromolecule that contains carbon, hydrogen, oxygen, and nitrogen; needed by the body for growth and repair |
macromolecules | carbohydrates, lipids, proteins, nucleic acids |
activation energy | energy that is needed for a reaction to begin |
enzymes | protein catalyst that speeds up the rate of specific reactions |
optimum pH | the best pH value, the point where the enzyme is most active |
adhesion | water molecules being attracted, or ''stick'', to other substances |
cohesion | water molecules being attracted, or "stick", to each other |
capillary action | tendency of water to rise in a thin tube, due to cohesion and adhesion |
theory | well tested explanation that unifies a broad range of observations and hypotheses, enabling scientist to make accurate predictions about new situations |