High School Cells Preview

Cells-High School

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Active Transport Animation At this site is an animation illustrating one way in which cells can use the energy in ATP to drive the uptake of ions or molecules.

Meiosis Tutorial This exercise is designed to help you understand the events that occur in process of meiosis, which takes place to produce our gametes.

CELLS alive! This is a highly visual site, where you'll find movies and animated illustrations on cell processes, parasites, penicillin and more.

Transport In and Out of Cells Cell membranes act as barriers to most, but not all, molecules. Development of a cell membrane that could allow some materials to pass while constraining the movement of other molecules was a major step in the evolution of the cell. Cell membranes are differentially (or semi-) permeable barriers separating the inner cellular environment from the outer cellular (or external) environment.

Mechanisms for Transport Across Membranes The plasma membrane functions to isolate the inside of the cell from its environment, but it is imperative that such isolation not be complete. A large number of molecules must constantly transit between the inside and outside of the cell, most frequently one-at-a-time, but also in large packages.

Cells and Organelles There are two main types or categories of cells: prokaryotic cells and eukaryotic cells. Both of these types of cells have several things in common. All cells are surrounded by a plasma membrane, which is made of a double layer (a bilayer) of phospholipids. Within this membrane, is the cytoplasm which is composed of the fluid and organelles of the cell.

Glencoe Online Quiz: Inside the Cell Take an interactive quiz on inside the cell. There are hints included with each question and you can check your answers.

Glencoe Online Quiz: The Cell and Its Environment Take an interactive quiz on cells and their environment. There are hints included with each question and you can check your answers.

Glencoe Online Quiz: Cellular Reproduction Take an interactive quiz on cellular reproduction. There are hints included with each question and you can check your answers.

Photosynthesis Photosynthesis is the process by which green plants and certain other organisms use the energy of light to convert carbon dioxide and water into the simple sugar glucose. In so doing, photosynthesis provides the basic energy source for virtually all organisms. An extremely important byproduct of photosynthesis is oxygen, on which most organisms depend.

BrainPop: Photosynthesis Play a movie and take an interactive quiz on Photosynthesis with BrainPop.

Homeostasis To remain alive and functioning normally, cells need a relatively constant environment from which they can obtain the materials they need to carry out the metabolic processes within them, and be able to dispose of their waste materials into the environment without them accumulating and becoming toxic.

Interactive Mitosis Tutorial Check out this interactive tutorial on mitosis. The Shockwave animations are vivid and interesting.

Cellular Respiration Cellular respiration is the process of oxidizing food molecules, like glucose, to carbon dioxide and water. The energy released is trapped in the form of ATP for use by all the energy-consuming activities of the cell.

Cellular Respiration There are two important ways a cell can harvest energy from food: fermentation and cellular respiration.

Respiration and Photosynthesis comparison Get a side by side comparison of respiration and photosynthesis.

Nucleotides Nucleic acids are linear, unbranched polymers of nucleotides and consist of three parts. . .

The Genetic Code DNA is a two-stranded molecule. Each strand is a polynucleotide composed of A (adenosine), T (thymidine), C (cytidine), and G (guanosine) residues polymerized by "dehydration" synthesis in linear chains with specific sequences.

The Genetic Code DNA transfers information to mRNA in the form of a code defined by a sequence of nucleotides bases. During protein synthesis, ribosomes move along the mRNA molecule and "read" its sequence three nucleotides at a time (codon) from the 5' end to the 3' end. Each amino acid is specified by the mRNA's codon, and then pairs with a sequence of three complementary nucleotides carried by a particular tRNA (anticodon).

DNA and Protein Synthesis With over 100,000 different proteins to manufacture, how the heck does our body get it right? When one thinks of the amount of information the body needs to keep track of, - eye, hair and skin color, protein sequence, toenail size, etc. - it would seem a task for a supercomputer to record all of the necessary information.

Classes of RNA: Structure and Function For the four-letter language of the genetic code (A, T, C, G) to be decoded into the 20-amino-acid language of polypeptides a variety of mediating molecules is required.

Origins of Life The site covers DNA structure, details of DNA replication, Meselson-Stahl experiment, and PCR (polymerase chain reaction).

DNA Transcription DNA transcription is the process in which DNA is copied into RNA; as a result the process can also be called RNA synthesis.

DNA Translation - Animated Explanation During translation gene sequences on messenger RNA(mRNA) are used to manufacture proteins. Translation occurs at special structures in the cell called ribosomes. Ribosomes are the "factories" where RNA is used to manufacture proteins. This process is shown in the animation.

MSN Learning & Research - Immunization Immunization, also called vaccination or inoculation, a method of stimulating resistance in the human body to specific diseases using microorganismsbacteria or virusesthat have been modified or killed. These treated microorganisms do not cause the disease, but rather trigger the body's immune system to build a defense mechanism that continuously guards against the disease. If a person immunized against a particular disease later comes into contact with the disease-causing agent, the immune system is immediately able to respond defensively.

The Cell Cycle & Mitosis Tutorial This exercise is designed to introduce you to the events that occur in the cell cycle and the process of mitosis that divides the duplicated genetic material creating two identical daughter cells.

Meiosis Meiosis is a special type of cell division that produces gametes with half as many chromosomes. The opposite process would be syngamy or fertilization, which is the union of the egg and sperm to restore the 2n number.

Studying Cells Tutorial This exercise is designed to review the scientific method and introduce you to the cell as the fundamental unit of life.

Virtual Cell Virtual Cell is a collection of still images, texts and movies covering the structure and functioning of a typical plant cell.

Online Onion Root Tips This experiment shows the time spent in different phases of the cell cycle.

Health Curriculum Quiz An interactive and entertaining way to learn about your health.