a living thing

a phospholipid layer that covers a cell's surface and acts as a barrier between the inside of a cell and the cell's environment

the region of the cell within the membrane that includes the fluid, the cytoskeleton, and all of the organelles except the nucleus

one of the small bodies in a cell's cytoplasm that are specialized to perform a specific function

a membrane-bound organelle that contains the cell's DNA and that has a role in processes such as growth, metabolism, and reproduction

a single-celled organism that does not have a nucleus or membrane-bound organelles

an organism made up of cells that have a nucleus enclosed by a membrane

the smallest unit of an element that maintains the properties of that element

a group of atoms that are held together by chemical bonds

a fat molecule or a molecule that has similar properties

a molecule that is made up of amino acids and that is needed to build and repair body structures and to regulate processes in the body

a class of molecules that includes sugars, starches, and fiber

a molecule made up of nucleotide subunits that carries information in cells

a lipid that contains phosphorus and that is a structural component in cell membranes