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Unit 5: Cells and Body Systems
Unit 5: Cells and Body Systems

... Cells and their Organelles Reading The cell is the basic unit of life. There are two types of cells, prokaryotes and eukaryotes. Prokaryotes are the simplest of all cells, they lack membrane bound organelles (like a nucleus or mitochondrion). Prokaryotes are microorganisms that do everything from m ...
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... The nucleus is the control center of the cell, much like the brain is the control center of humans. It is enclosed by a membrane called the nuclear envelope. The nucleus contains the genetic material (DNA) that determines what an organism will look like. This genetic DNA is found on structures calle ...
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Cell Analogy - Biloxi Public Schools
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... The nucleus controls the cell’s functions and contains DNA. The castle controls the kingdom and contains the queen. DNA contains the instructions for making proteins and enzymes, which repair the cell and drive cell processes. The queen’s brain contains all the information needed to make decisions t ...
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Cell Analogy - Calmeca Academy

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If Conwell Were a Cell… You will be able to

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CEE 210 Environmental Biology for Engineers
CEE 210 Environmental Biology for Engineers

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< 1 ... 375 376 377 378 379 380 381 382 383 ... 852 >

Cell cycle



The cell cycle or cell-division cycle is the series of events that take place in a cell leading to its division and duplication (replication) that produces two daughter cells. In prokaryotes which lack a cell nucleus, the cell cycle occurs via a process termed binary fission. In cells with a nucleus, as in eukaryotes, the cell cycle can be divided into three periods: interphase, the mitotic (M) phase, and cytokinesis. During interphase, the cell grows, accumulating nutrients needed for mitosis, preparing it for cell division and duplicating its DNA. During the mitotic phase, the cell splits itself into two distinct daughter cells. During the final stage, cytokinesis, the new cell is completely divided. To ensure the proper division of the cell, there are control mechanisms known as cell cycle checkpoints.The cell-division cycle is a vital process by which a single-celled fertilized egg develops into a mature organism, as well as the process by which hair, skin, blood cells, and some internal organs are renewed. After cell division, each of the daughter cells begin the interphase of a new cycle. Although the various stages of interphase are not usually morphologically distinguishable, each phase of the cell cycle has a distinct set of specialized biochemical processes that prepare the cell for initiation of cell division.
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