Ask Nature - the Biomimicry Design Portal: biomimetics, architecture, biology, innovation inspired by nature, industrial design - Ask Nature - the Biomimicry Design Portal: biomimetics, architecture, biology, innovation inspired by nature, industrial desi What Is a Cell? | Learn Science at Scitable As previously mentioned, a cell's cytoplasm is home to numerous functional and structural elements. These elements exist in the form of molecules and organelles — picture them as the tools, appliances, and inner rooms of the cell. Major classes of intracellular organic molecules include nucleic acids, proteins, carbohydrates, and lipids, all of which are essential to the cell's functions. Nucleic acids are the molecules that contain and help express a cell's genetic code. Proteins are a second type of intracellular organic molecule. Carbohydrates, the starches and sugars in cells, are another important type of organic molecule. Finally, lipids or fat molecules are components of cell membranes — both the plasma membrane and various intracellular membranes. Some cells also feature orderly arrangements of molecules called organelles. Figure 2: The composition of a bacterial cell Most of a cell is water (70%). Figure 3: The relative scale of biological molecules and structures
Various ways to rate a college There are a bunch of college ratings out there to help students decide what college to apply to (and give something for alumni to gloat about). The tough part is that there doesn't seem to be any agreement on what makes a good college. Alex Richards and Ron Coddington describe the discrepancies. Notice how few measures are shared by two or more raters. This, on top of spotty data across universities, makes rankings, especially for schools that are close in ratings to each other, difficult to know which one to follow. But you already knew that, right? One thing is for sure though. [Thanks, Ron]
Four Stages of Cellular Respiration Cellular respiration is the sum of the various biochemical means that eukaryotic organisms employ to extract energy from food, specifically glucose molecules. The cellular respiration process includes four basic stages or steps: Glycolysis, which occurs in all organisms, prokaryotic and eukaryotic; the bridge reaction, which stets the stage for aerobic respiration; and the Krebs cycle and the electron transport chain, oxygen-dependent pathways that occur in sequence in the mitochondria. The steps of cellular respiration do not happen at the same speed, and the same set of reactions may proceed at different rates in the same organism at different times. Cellular Respiration Equation The complete cellular respiration formula looks slightly different from source to source, depending on what the authors choose to include as meaningful reactants and products. Glycolysis Glycolysis takes place in the cytoplasm. The Bridge Reaction The Krebs Cycle The Electron Transport Chain
SMART - Servier Medical ART Cell Size and Scale Some cells are visible to the unaided eye The smallest objects that the unaided human eye can see are about 0.1 mm long. That means that under the right conditions, you might be able to see an ameoba proteus, a human egg, and a paramecium without using magnification. Smaller cells are easily visible under a light microscope. To see anything smaller than 500 nm, you will need an electron microscope. Adenine The label on the nucleotide is not quite accurate. How can an X chromosome be nearly as big as the head of the sperm cell? No, this isn't a mistake. The X chromosome is shown here in a condensed state, as it would appear in a cell that's going through mitosis. A chromosome is made up of genetic material (one long piece of DNA) wrapped around structural support proteins (histones). Carbon The size of the carbon atom is based on its van der Waals radius.
Home(page) Movies - QT and Flash to illustrate Biological Processes Register in Our Guestbook and Submit Comments Movie credits and additional information This page was reviewed in Science, 7 March, 2003. Movies of Cells Movies of Cellular Calcium Movies of Molecular Methods Molecular Movies - by A. These animations are made with the Macromedia program called Flash, and require the appropriate browser plug-in. Somatic Recombination of a light chain to demonstrate how antibodies can bind to so many different epitopes. Miscellaneous Movies Interactive Pages Credits (updates in progess) QT movies of mitosis, meiosis, calcium pumping into SER, calcium regulating muscles, the yeast two-hybrid system, and PCR developed by A. Simultaneous imaging of an egg at fertilization by phase contrast (left) and Ca Green fluorescence (right). Movie of mouse embryo from gestational day 9.5 through birth by THE CENTER FOR IN VIVO MICROSCOPY at Duke Univ. More animations and images can be found on the FlyBase page. Davidson College Biology Department Home Page Sign our Guestbook
FlowingData | Data Visualization, Infographics, and Statistics Plant and Animal Cell Worksheets This collection of animal and plant cell worksheets strikes a balance between cognitive and psychomotor domains of learning and offers a conceptual grounding in cell biology. The worksheets recommended for students of grade 4 through grade 8 feature labeled animal and plant cell structure charts and cross-section charts, cell vocabulary with descriptions and functions and exercises like identify and label the parts of the animal and plant cells, color the cell organelles, match the part to its description, fill in the blanks, crosswords and more. Diffuse into a cell with our free worksheets! Plant Cell Diagram | Animal Cell Diagram Featured in this printable worksheet are the diagrams of the plant and animal cells with parts labeled vividly. Cell Vocabulary How does a minute cell accomplish complex tasks? Plant cell vs Animal cell What is the difference between a plant cell and an animal cell? Cross-Section of a Plant Cell Label the Parts of a Plant Cell Name the Parts of a Plant Cell