Question

Control of cell division cycle in yeast and mammalian cells

Answer 1

actually it helps to elaborate the cell that's why the nutrition can go inside

Answer 2

In multicellular organisms, precise control of the cell cycle during development and growth is critical for determining the size and shape of each tissue. Cell replication is controlled by a complex network of signaling pathways that integrate extracellular signals about the identity and numbers of neighboring cells and intracellular cues about cell size and developmental program. Most cells withdraw from the cell cycle during G1, entering the G0 state, to differentiate (see Figure 13-1). Some differentiated cells (e.g., fibroblasts and lymphocytes) can be stimulated to reenter the cycle and replicate. Many differentiated cells, however, never reenter the cell cycle to replicate again; they are referred to as postmitotic cells. As we discuss in this section, the cell-cycle regulatory mechanisms uncovered in yeasts and Xenopus eggs and early embryos also operate in the somatic cells of higher eukaryotes including humans and other mammals.

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Mammalian Restriction Point is Analogous to start in Yeast Cells

Most studies of mammalian cell-cycle control have been done with cultured cells that require certain polypeptide growth factors (mitogens) to stimulate cell proliferation. Binding of these growth factors to