Cells

Descripción

cell organelles
Anapaz Solano
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Anapaz Solano
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Cells
  1. Cytoskeleton
    1. Is a network of proteins that is constantly changing to meet the needs of the cells
      1. It is a small protein It is made of small protein subunits that form long threads, or fibers, that crisscross the entire cell
      2. Microtubules are long hollow tubes. They give the cell its shape and act as “tracks” for the movement of organelles.
        1. Intermediate filaments, which are somewhat smaller than microtubules, give a cell its strength.
          1. Microfilaments, the smallest of the three, are tiny threads that enable cells to move and divide.
          2. Cytoplasm
            1. It fills the space between the nucleus and the cell membrane. Cytosol consists mostly of water. It is usually clear and colorless
            2. Nucleus
              1. The nucleus is the storehouse for most of the genetic information, or DNA in your cells. DNA contains genes that are instructions for making proteins. Is made of chromatin
                1. Cell’s DNA enclosed in a double membrane called the nuclear envelope. Each membrane in the nuclear envelope is similar to the membrane surrounding the entire cell.
                  1. The nucleolus is a dense region where tiny organelles essential for making proteins are assembled.
                    1. The nuclear envelope is pierced with holes called pores that allow large molecules to pass between the nucleus and cytoplasm.
                    2. Endoplasmic Reticulum
                      1. Smooth ER
                        1. Surfaces of the ER that do not contain ribosomes are called smooth ER. Smooth ER makes lipids and performs a variety of other specialized functions, such as breaking down drugs and alcohol.
                        2. Rough ER
                          1. Surfaces of the ER that are covered with ribosomes are called rough ER because they look bumpy when viewed with an electron microscope.
                          2. Is an interconnected network of thin folded membranes.
                          3. Ribosomes
                            1. Are tiny organelles that link amino acids together to form proteins. Ribosomes are both the site of protein synthesis and active participants in the process. Ribosomes are made of proteins and RNA
                            2. Golgi Apparatus
                              1. Consists of closely layered stacks of membrane-enclosed spaces that process, sort, and deliver proteins. Its membranes contain enzymes that make additional changes to proteins.
                              2. Vesicles
                                1. Are a general name used to describe small membrane-bound sacs that divide some materials from the rest of the cytoplasm and transport these materials from place to place within the cell.
                                2. Mitochondria
                                  1. Supply energy to the cell. Mitochondria are bean shaped and have two membranes
                                    1. The inner membrane has many folds that greatly increase its surface area. Within these inner folds and compartments, a series of chemical reactions converts molecules from the food you eat into usable energy.
                                      1. The intermembrane space plays a pivotal role in the coordination of mitochondrial activities with other cellular processes.
                                        1. The fluid contained in the mitochondria is called the matrix.
                                          1. The outer membrane covers the organelle and contains it like a skin.
                                          2. Lysosomes
                                            1. Are membrane-bound organelles that contain enzymes. They defend a cell from invading bacteria and viruses. They also break down damaged or worn-out cell parts.
                                            2. Centrosome
                                              1. Is a small region of cytoplasm that produces microtubules
                                              2. Centrioles
                                                1. Are cylinder-shaped organelles made of short microtubules arranged in a circle. The two centrioles are perpendicular to each other.
                                                2. Cell Wall
                                                  1. Is a rigid layer that gives protection, support, and shape to the cell.
                                                  2. Chloroplasts
                                                    1. Are organelles that carry out photosynthesis, a series of complex chemical reactions that convert solar energy into energy rich molecules the cell can use.
                                                      1. The space between the inner membrane and the thylakoid membrane is filled with stroma, a matrix containing dissolved enzymes, starch granules, and copies of the chloroplast genome.
                                                        1. They also have stacks of disc-shaped sacs, contain chlorophyll, a light-absorbing molecule that gives plants their green color and plays a key role in photosynthesis
                                                          1. Grana are stacks of thylakoids within chloroplasts.
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