will occupy the latice points that define the face centered cubic unit cell, with the zinc ions occupying the tetrahedral holes. Since there are four sulfide ions (FCC), we need only four zinc ions to ...

Cells are the smallest unit of life. Cells in multicellular plants ... cells with the same function group together. For example, millions of muscle cells make up muscle tissue.

Although cells can be quite large — consider a frog's egg, for example — most are too small ... key characteristics that define a cell? This unit answers these questions and provides a basic ...