Here are data from several complementation experiments, involving rapid-lysis mutations in genes rIIA and rIIB. The strain designated L51 is known to have a mutation in rIIB. Phage Mixture ComplementationL91 and L65 NoL65 and L62 NoL33 and L47 YesL40 and L51 NoL47 and L92 NoL51 and L47 YesL51 and L92 YesL33 and L40 NoL91 and L92 YesL91 and L33 NoList which groups of mutations are in the rIIA gene and which groups are in the rIIB gene.

rIIA: L47 and L92  

rIIB: L33, L40, L51, L62, L65, L91  

Since L40 with L51 can't show complementation, L40 has a place with rIIB. Further, L40 with L33 can't show complementation demonstrating that L33 has a place with rIIB. Further, L33 and L47 show complementation and L47 and L92 don't show complementation, henceforth L92 and L47 has a place with rIIA. Along these lines all groups can be allocated.

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!