Question

What central theme of biology helps explain why various cells can look so different from one another? see section 7.3 ( page 154) ?

Answer 1

The Cell theory states that.. 1)all living things are composed of one or more cells 2)cells are the smallest units of structure & function of living things 3)New cells are produced by preexisting cells The 2 Domains that include all organisms that are made of prokaryotic cells are- bacteria and archaea. these organisms are multicellular and may form colonies cytoplasm fluid part of the cell plasma membrane : membrane surrounding the cell ribosomes : solid,molecular organelles that make proteins Circular DNA molecule in prokaryotes where genes are found plasmids cell wall rigid structure around plasma membrane Used for swimming (moving) through a liquid flagellum used to adhere to surfaces (like your teeth) fimbriae as a cell increases in diameter, its volume increases more than its surface area. the surface area to volume ratio is reduced since the surface is where the cell exchanges substances w/its environment, the reduction in this ratio decreases the rate of exchange. thus making cell work less efficient