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Topic: Cell structure


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In the News (Sat 19 Dec 09)

  
  Biology4Kids.com: Cell Structure
Cells are small compartments that hold all of the biological equipment necessary to keep an organism alive and successful on Earth.
Cells hold a variety of pieces and each cell has a different set of functions.
Plant cells are easier to identify because they have a protective structure called a cell wall made of cellulose.
www.biology4kids.com /files/cell_main.html   (371 words)

  
  Medmicro Chapter 2
The principal surface layers are capsules and loose slime, the cell wall of Gram-positive bacteria and the complex cell envelope of Gram-negative bacteria, plasma (cytoplasmic) membranes, and mesosomal membrane vesicles, which arise from invaginations of the plasma membrane.
In bacteria, the cell wall forms a rigid structure of uniform thickness around the cell and is responsible for the characteristic shape of the cell (rod, coccus, or spiral).
The topographic relationships of the cell wall and envelope layers to the plasma membrane are indicated in the thin section of a Gram-positive organism (Micrococcus lysodeikticus) in Figure 2-5A and in the freeze-fractured cell of a Gram-negative organism (Bacteroides melaninogenicus) in Figure 2-5B.
gsbs.utmb.edu /microbook/ch002.htm   (5515 words)

  
 Cells, Tissues, and Membranes / Cell Structure
The structural and functional characteristics of different types of cells are determined by the nature of the proteins present.
Cells of various types have different functions because cell structure and function are closely related.
Cell division is the process by which new cells are formed for growth, repair, and replacement in the body.
training.seer.cancer.gov /module_anatomy/unit2_1_cell_functions_2.html   (475 words)

  
 Bacterial Cell Model
DNA in the bacterial cell is generally confined to this central region.
Though it isn't bounded by a membrane, it is visibly distinct (by transmission microscopy) from the rest of the cell interior.
This layer of polysaccharide (sometimes proteins) protects the bacterial cell and is often associated with pathogenic bacteria because it serves as a barrier against phagocytosis by white blood cells.
www.cellsalive.com /cells/bactcell.htm   (458 words)

  
 Cell structure
Structure -The structure is characterized by a double membrane which creates two areas within the organelle.
Structure - is surrounded by a membrane which is similar in structure to the plasma or cell membrane.
Structure - consists of densely packed chromosomes, protein and precursor RNA strands from which the subunits of ribosomes are formed.
abbysenior.com /biology/cell_structure.htm   (858 words)

  
 ScienceMatrix: Cell Structure & Function
ScienceMatrix: Cell Structure and Function is closely aligned with and supports the middle- and secondary-level science curriculum you are already working with.
Taking full advantage of current technology to help you teach science better, it works in conjunction with your existing teaching implements to provide hands-on activities to help students understand even the most challenging topics.
Cell Structure and Function is now available for licensed school use as a standalone CD-ROM or an unlimited site license.
www.sciencematrix.com   (190 words)

  
 Rader's BIOLOGY 4 KIDS.COM
We have information on cell structure, cell function, scientific studies, plants, vertebrates, invertebrates, and other life science topics.
An entire living thing can be one cell or it can be billions.
Most cells on Earth have similar pieces and parts.
www.biology4kids.com   (350 words)

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