(looped around histone proteins) - thread like material (that coils to form chromosomes) - immersed in nucleoplasm - packages and winds DNA up - chromatin plays a role in mitosis - DNA replication - prevents DNA damage - controls gene expression - Chromatin’s thin threadlike structure helps it undergo mitosis where it forms into chromosomes. - packages and winds DNA up so that it has a smaller volume. A smaller volume allows the DNA to fit in the cell Chromo-somes - Usually
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Abstract: Using genes that control development makes it possible to identify mutants that alter development. Anterior –Posterior axis formation is controlled by protein gradients in the early embryo development. Bicoid and nanos mRNAs are both maternally provided and are localized to opposite poles of the embryo (Springfield‚ 2016). Bicoid proteins are concentrated at the anterior end and nanos proteins concentration is highest at the posterior end of the embryo (Springfield‚ 2016). The combination
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R E V I E W S H E E T EXERCISE 4 Print Form Anatomy of the Composite Cell 1. Define the following terms: are the metabolic machinery of the cell‚ the are highly organized tp carry out specific functions of the organelle: cell as a whole. the structural and functional unit of all living things. cell: 2. Although cells have differences that reflect their specific functions in the body‚ what functions do they have in common? All cells can maintain their own boundaries‚ metabolize
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Midterm 1 stuff (1‚ 25‚ 26‚ 27‚ 28) 2) What characterizes a prokaryotic cell? a. the lack of ribosomes b. the lack of a membrane-enclosed nucleus c. the presence of a nucleus with no DNA d. the presence of mitochondria e. having a cell wall without a cell membrane 3) Which of the following does NOT comprise a logical hierarchy of organization? a. family‚ order‚ class‚ phylum‚ kingdom b. molecules‚ cells‚ tissues‚ organ systems‚ populations c. organisms‚ populations‚ communities‚ biomes
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Grade 10 Science ULTIMATE Study Guide Biology – Key Concepts Cell Cycle – The life of a cell (thug lyfe). This includes growth‚ DNA replication‚ prep for mitosis and mitosis. Mitosis Interphase; first growth phase: the cell produces new proteins and organelles. Synthesis phase: the dna is replicated in preporation for mitosis. Second growth phase: the cell produces the organelles and structures needed for cell division. Prophase; Chromatic condense into chromosomes‚ which are sister
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meanings. A. Diffusion‚ osmosis Diffusion is the process where molecules move from a region of high concentration to a region of low concentration. Osmosis is basically the same‚ but with water. B. cell division‚ mitosis Cell division is part of mitosis‚ when a cell splits into two. Mitosis has more steps than just cell division. C. facilitated diffusion‚ active transport Active transport is where a cell uses energy to move molecules. Facilitated diffusion is the same as diffusion‚ just when they
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daughter cells. In cells without a nucleus‚ the cell cycle occurs via a process termed binary fission. In cells with a nucleus‚ the cell cycle can be divided in three periods: interphase—during which the cell grows‚ accumulating nutrients needed for mitosis preparing it for cell division and duplicating its DNA—and the mitotic phase‚ during which the cell splits itself into two distinct cells‚ often called "daughter cells" and the final phase‚ cytokinesis‚ where the new cell is completely divided. The
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reaches an isotonic state (or equilibrium). At that point‚ molecules will move equally across the membrane. 10-1 Cell Growth surface-area-to-volume-ratio: the ratio of surface area to volume cell division: division of a cell (also called mitosis) Explain why larger organisms are made of many small cells rather than one large cell‚ emphasizing the concept of a large surface-area-to-volume ratio. - It is more efficient for an organism to be made of many small cells so as many nutrients
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Results: In Allium cepa‚ the cell walls surrounding the cells were generally a rectangular shape and somewhat in columns. The cell walls were very distinct because they were dark purple. Most of the cells were in interphase. Here‚ the nucleus could clearly be seen‚ taking up about one third of the space inside the cell. Most cells in interphase had one nucleolus inside the nucleus‚ but some had multiple. The nuclei were pink because of the stain and the nucleoli were a much darker pink. The cytoplasm
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Prokaryotic chromosome contains mostly DNA and some associated proteins Asexual reproduction requires a single parent; offspring are genetically identical to parent. EUKARYOTES Meiosis and Mitosis MEIOSIS Meiosis is essential for sexual reproduction and therefore occurs in all eukaryotes MITOSIS process in which a eukaryotic cell separates the chromosomes in its cell nucleus into two identical sets in two daughter nuclei. It is generally followed immediately by cytokinesis
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