Microscopes provide windows to the world of the cell. Cell biologists can isolate organelle to study their functions. Prokaryotis and eukaryotic cells differ in size and complexity. Internal membranes compartmentalize the functions of a eukaryotic cell. The nucleus contains a eukaryotic cell's genetic library. Ribosomes build a cell's proteins. The nucleus contains a eukaryotic cell's genetic library. Ribosomes build a cell's proteins. The endoplasmic reticulum manufactures membranes and performs many other biosynthetic functions. The golgi apparatus finishes, sorts, and ships cell products. Lysosomes are digestive compartments. Vacuoles have diverse functions in cell maintenance. Mitochondria and chloroplasts are the main energy transformers of cells. Peroxisomes generate and degrade H2O2 in performing various metabolic functions. Providing structural support to the cell, the cytoskeleton also functions in cell motility and regulation. Plant cells are encased by cell walls. The extracellular matrix (ECM) of animal cells functions in support, adhesion, movement, and regulation. Intercellular junctions help integrate cells into higher levels of structure and function. The cell is a living unit greater than the sum of its parts. Membrane models have evolved to fit new data. THey are fluid and are mosaics of structure and function and membrane carbohydrates are important for cell-cell recognition. A membrane's molecular organization results in selective permeability. Cell signaling evolved early in the history of life. Communicating cells maybe close together or far apart. Most signal receptors are plasma membrane proteins. In response to a signal, a cell may regulate the activities in the cytoplasm or transcription in the nucleus. Elaborate pathways amplify and specify the cell's response to signals.
Sunday, January 22, 2012
The Cell
Microscopes provide windows to the world of the cell. Cell biologists can isolate organelle to study their functions. Prokaryotis and eukaryotic cells differ in size and complexity. Internal membranes compartmentalize the functions of a eukaryotic cell. The nucleus contains a eukaryotic cell's genetic library. Ribosomes build a cell's proteins. The nucleus contains a eukaryotic cell's genetic library. Ribosomes build a cell's proteins. The endoplasmic reticulum manufactures membranes and performs many other biosynthetic functions. The golgi apparatus finishes, sorts, and ships cell products. Lysosomes are digestive compartments. Vacuoles have diverse functions in cell maintenance. Mitochondria and chloroplasts are the main energy transformers of cells. Peroxisomes generate and degrade H2O2 in performing various metabolic functions. Providing structural support to the cell, the cytoskeleton also functions in cell motility and regulation. Plant cells are encased by cell walls. The extracellular matrix (ECM) of animal cells functions in support, adhesion, movement, and regulation. Intercellular junctions help integrate cells into higher levels of structure and function. The cell is a living unit greater than the sum of its parts. Membrane models have evolved to fit new data. THey are fluid and are mosaics of structure and function and membrane carbohydrates are important for cell-cell recognition. A membrane's molecular organization results in selective permeability. Cell signaling evolved early in the history of life. Communicating cells maybe close together or far apart. Most signal receptors are plasma membrane proteins. In response to a signal, a cell may regulate the activities in the cytoplasm or transcription in the nucleus. Elaborate pathways amplify and specify the cell's response to signals.
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