You are observing different tissue samples and classifying the cells into their respective stage in the cell cycle. what can you conclude about sample b based on these observations? a) sample b is is most likely cancerous because most of the cells are in interphase. b) sample b is most likely cancer tissue because most cells are in some stage of mitosis. c) sample b is most likely a normal tissue sample because most of the cells are in interphase. d) sample b is most likely a normal tissue sample because most cells are in some stage of mitosis.

We have been given that different tissue samples are in their respective stage  of cell cycle.

Ans is option B because cancerous cells tend to divide indefinitely regardless of the presence or absence of growth factors. In cancerous cells G0 check points fail and the cells are always in some stage of mitosis i.e. cell is supposed to be in any of the following stages of mitosis :

1) Prophase

2) Metaphase

3) Anaphase

4) Telophase

D)Samples A & C indicate cancer due to the large proportion of cells in some stage of mitosis compared to the cells in interphase.  

Sample:Number of Cells in InterphaseNumber of Cells in ProphaseNumber of Cells in MetaphaseNumber of Cells in AnaphaseNumber of Cells in Telophase

Sample A615478

Sample B254231

Sample C49536

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!