1). Each phase is associated with a specific cellular function: typically growth‚ synthesis‚ and division. The G1‚ S‚ and G2 phases comprise a larger phase called interphase. During interphase‚ the cell grows and synthesizes (replicates) DNA in preparation for division. The G1 phase‚ also called Gap 1‚ is the first phase of interphase. During G1‚ the cell increases in size. The S phase‚ also called the synthesis phase‚ follows G1. During S phase‚ the cell synthesizes DNA. Each chromosome is now comprised
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This is illustrated by Fig 1. DNA quantity/arbitrary units Fig 1. The eukaryotic cell cycle 4 G2 2 S Mitosis Cyt oki G1 nes is S G2 cell division G1 time G1 The G1‚ S and G2 phases are termed interphase. Interphase is the stage of the cell cycle between cell divisions. It is not a resting stage‚ since in an actively dividing and growing cell new DNA and proteins are being synthesised and in a non-dividing mature cell‚ the G1 or G2 cell is performing
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Interphase: DNA replicates ( S-phase) Prophase: Nucleolus fades and chromatin (replicated DNA and associated proteins) condenses into chromosomes. Each replicated chromosome comprises two chromatids‚ both with the same genetic information. Microtubules of the cytoskeleton‚ responsible for cell shape‚ motility and attachment to other cells during interphase‚ disassemble Pro Metaphase: - nuclear envelope breaks down- no longer a recognizable nucleus. Mitotic spindle fibers elongate from the centrosomes
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What are chromosomes‚ and what are they made of? How many chromosomes do human cells contain? What is chromatin made of? The diagram at right shows the relationship between DNA and chromosomes What is the difference between chromatin during Interphase and during Mitosis? Label the parts of the chromosome at right Chromosomes are structures in the cell that contain the genetic information that is passed on from one generation of cells to the next. They are made of chromatin Human cells contain
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Nucleolus Nucleolus is a small dense small dense spherical structure in the nucleus of a cell during interphase. The nucleolus is located inside the nucleus in the category eukaryotic cells. The nucleolus make ribosomal subunits from proteins and ribosomal RNA‚ here is a fun fact RNA could be also called rRNA.Ribosome makes proteins and nucleolus makes proteins inside a cell . A ribosomes they have two category‚ one is the large the other is the small. Each subunit is separately from nucleolus. Nucleolus
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During the metaphase of mitosis‚ sister chromatids are visible and attach to each other at the centromere. Table 1: Record your data for the number of cells in each stage of the cell cycle observed in normal tissues. Tissue Type # Cells in Interphase # Cells in Prophase # Cells in Metaphase # Cells in Anaphase # Cells in Telophase Lung Tissue Sample 1 19 1 0 0 0 Lung Tissue Sample 2 19 0 0 1 0 Stomach Tissue Sample 1 16 1 1 0 2 Stomach Tissue Sample 2 18 0 1
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Eukaryotic Cell Division Cells must continually grow and divide in order for an organism to grow‚ maintain its structure‚ and reproduce. Cell division involves the replication‚ or copying‚ of the complete set of hereditary information. It also involves the equal distribution of the genetic material in the resulting cells. The hereditary information of organisms is contained in large molecules called deoxyribonucleic acid‚ DNA. Objectives Upon completion of this laboratory
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to each other and to their parent cell. The process of mitosis is complex and highly regulated. The sequence of events is divided into phases‚ corresponding to the completion of one set of activities and the start of the next. These stages are interphase‚ prophase‚ metaphase‚ anaphase and telophase. During mitosis the pairs of chromosomes condense and attach to fibers that pull the sister chromatids to opposite sides of the cell. The cell then divides in cytokinesis‚ to produce two identical daughter
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Living and Growing. Events during Mitosis | | Interphase: Cells may appear inactive during this stage‚ but they are quite the opposite. This is the longest period of the complete cell cycle during which DNA replicates‚ the centrioles
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Mitosis Review 1. So why does cell division occur? Cell division occurs because an organisms such as plants‚ animals and such need to grow on a molecular level in order for them to continue thriving. For example‚ new cells are created with the intention of replacing old cells and tissues‚ with fresh and functioning ones... for most part. In humans and other organisms‚ organ cells‚ muscle cells‚ bone cells and such are constantly replace for growth and prolongation of proper function. Also‚ embryos
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