The Cell Image Library. Site de Michel Pronovost > Cours de biologie NP1 > Cellules. Cell and Molecular Biology Online. 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. There are two major classes of nucleic acids: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the molecule that contains all of the information required to build and maintain the cell; RNA has several roles associated with expression of the information stored in DNA. Of course, nucleic acids alone aren't responsible for the preservation and expression of genetic material: Cells also use proteins to help replicate the genome and accomplish the profound structural changes that underlie cell division. 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. Vol. 299. pg. 1493. 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. BIODIC. Animal Cells. Chapter 1: An Owner's Guide to the Cell: Inside the Cell - National Institute of General Medical Sciences. Chapter 1: An Owner's Guide to the Cell By Alisa Zapp Machalek Welcome!
I hope the transformation wasn't too alarming. You have shrunk down to about 3 millionths of your normal size. You are now about 0.5 micrometers tall (a micrometer is 1/1000 of a millimeter). But don't worry, you'll return to your normal size before you finish this chapter. At this scale, a medium-sized human cell looks as long, high, and wide as a football field. Now that your eyes have adjusted to the darkness, let's explore, first-hand and up close, the amazing world inside a cell. Nucleus: The Cell's Brain Nucleus Look down. The nucleus is the most prominent organelle and can occupy up to 10 percent of the space inside a cell. Go ahead—jump. If you exclude the nucleus, the rest of the cell's innards are known as the cytoplasm. Virtually all forms of life fall into one of two categories: eukaryotes or prokaryotes.
Back to Top Cell Membrane: Specialist in Containing and Communicating Rough ER SUSUMU ITO Lysosomes Blink. CELLS alive! Modele-discipline.