You have discovered a new organism with a very simple actin cytoskeleton. In the resting state this cell has a lot of short actin filaments underneath the plasma membrane. These actin filaments are capped at their plus ends by the capping protein Gelsolin. The minus ends of these filaments are NOT capped and there are no other proteins bound to the actin filaments. The actin filaments in this resting cell are not growing or shrinking. When the cell receives a stimulus to move it generates a lipid called PI(4,5)P2 which we will learn about later in the course. This lipid binds to Gelsolin and inactivates it releasing the actin filaments. Based on this (fictional) story answer the following questions: a. What is the concentration of G-actin in the resting cell?
b. In the resting cells why are the actin filaments not growing or shrinking?
c. What will happen to the actin filaments when Gelsolin is inactivated in the stimulated cell? Will they grow, shrink or stay the same? Why?

the concept of nucleosome occupancy, which reflects the fraction of cells from the population in which a given region of dna is occupied by a histone octamer

answer: 45

explanationyou have to add as well to be it could be

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!