RESPOND THOUGHTFULLY TO THIS DISCUSSION POST. The Question: How do the cellular proteins function (and coordinate) to accurately permit cell division? Describe at least one protein and its associated functions to support your answer.

The Person's Cellular proteins play a significant role in permitting cell division, there are a plethora of different types of proteins that each function differently but are all part of a large role that is cell division. The cellular proteins help during the method of cell division by helping with the progress of moving forward into the other phases of cell division. One method of cell division is the bacterial cell division also known as binary fission. This type of division does not happen through mitosis or meiosis but through a method known as septation, which is when a septum grows from the side of the cell into the cell and performs the separation of the daughter cells while protein and RNA production is still occurring. Multiple sorts of proteins assist in this method, such as the FtsZ protein that leads the growth of the septum, or the penicillin binding protein that assist in the production of peptidoglycan..etc, the process of septation is heavily dependent on the cellular proteins or protein complex referred to as divisome.

A fertilized mouse egg and a fertilized human egg are similar in size, yet they produce animals of very different sizes. What factors in the control of cell behavior in humans and mice are responsible for these size differences? The same fundamental question can be asked for each organ and tissue in an animal's body. What factors in the control of cell behavior explain the length of an elephant's trunk or the size of its brain or its liver? These questions are largely unanswered, at least in part because they have received relatively little attention compared with other questions in cell and developmental biology. It is nevertheless possible to say what the ingredients of an answer must be.

The size of an organ or organism depends mainly on its total cell mass, which depends on both the total number of cells and the size of the cells. Cell number, in turn, depends on the amounts of cell division and cell death. Organ and body size are therefore determined by three fundamental processes: cell growth, cell division, and cell death. Each is independently regulated—both by intracellular programs and by extracellular signal molecules that control these programs.

The extracellular signal molecules that regulate cell size and cell number are generally either soluble secreted proteins, proteins bound to the surface of cells, or components of the extracellular matrix

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fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

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