16) cells that elongate their cell walls prior to septation and septate in parallel planes will form choose one: a. tetrads of rods (bacilli).
 b. chains of rods (bacilli).
 c. tetrads of spheres (cocci). d. chains of spheres (cocci).
 18) the major organic component (by total weight) of a bacterial cell is 
 choose one: a. dna b. protein c. water d. rna 15)proteins that transport only one kind of molecule down (with) that molecule’s concentration gradient are involved in choose one: a. passive transport. b. active transport. c. facilitated diffusion. d. coupled transport. 5)which of the following is the most convincing evidence for the bacterial origin of mitochondria? choose one: a. mitochondria contain a circular chromosome. b. mitochondria are surrounded by a single membrane. c. mitochondria contain their own ribosomes. d. there is only one mitochondrion per eukaryotic cell.