Use the Figure to Answer the Question Below.
Use the figure to answer the question below. In the figure, MPF reaches its highest concentration during this stage. A) I B) II C) III D) IV
Density-dependent inhibition is explained by which of the following processes? A) As cells become more numerous, they begin to squeeze against each other, restricting their size. B) As cells become more numerous, the cell surface proteins of one cell contact the adjoining cells, and they signal each other to stop dividing. C) As cells become more numerous, the protein kinases they produce begin to compete with each other, such that the proteins produced by one cell essentially cancel those produced by its neighbour. D) As cells become more numerous, the level of waste products increases, which slows metabolism and inhibits growth.
Besides the ability of some cancer cells to over proliferate, which of the following situations might logically result in a tumour? A) changes in the order of cell cycle stages B) lack of appropriate cell death C) inability to form spindles D) failure of cells to enter S phase
Early observations of a cultured cell line indicated that the cells did not exhibit either density-dependent inhibition or anchorage dependence. What do these observations suggest about this cell line? A) The cells are unable to form spindle microtubules. B) The cells follow an altered series of cell cycle phases. C) The cells show characteristics of tumours. D) The cells have nonfunctional MPF.