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In the early 1950s, American biologist James Watson and British physicist Francis Crick came up with their famous model of the DNA double helix. The structure of DNA, as represented in Watson and Crick's model, is a double-stranded helix. The sugar-phosphate backbones of the DNA strands make up the outside of the helix, while the nitrogenous bases are found on the inside and form hydrogen-bonded pairs that hold the DNA strands together. Other topics covered include DNA replication, RNA transcription, and RNA translation. Part of the "Biology" series.
(Source: DCMP)
Genes, those traits passed down to us by our parents, are the things that make each of us different from the others. This question-answer format covers basic information about genes, chromosomes, cell division, dominant and recessive genes, and fertilization. Illustrates Mendel's rules of heredity. Covers advances in the fields of DNA, genetic engineering, and gene therapy. Reviews major points.
Host Alex Dainis discusses mitrochondrial DNA, which is the smallest circular chromosome found inside mitochondria. These organelles found in cells have often been called the powerhouse of the cell. The mitochondria, and thus mitochondrial DNA, are passed almost exclusively from mother to offspring through the egg cell.
Why is RNA just as cool as DNA? Join the Amoeba Sisters as they compare and contrast RNA with DNA. Part of "The Amoeba Sisters" series.
Dr. Sera Thornton, a biologist at MIT, answers the question, "Is there any way to make a unicorn by crossing DNA?" Part of the "#askMIT" series.
Scientist Bruce Jackson traces ancestry and solves crimes with the powerful tool DNA. Part of the Scientists and Engineers On Sofas Series.
Part of the "Visualizing Cell Processes" series. Includes the following modules: "Mitosis: Chromosome Condensation," "Mitosis: Stages," "Cytokinesis," "Meiosis," "Nucleotide Structure and Bonding," "Replication Enzymes," "Replicating the Strands," "The Twisting Problem," and "Proofreading and Repair."
No organism lives forever. The length of time animals and humans live is influenced by their genes. Scientists have made astonishing discoveries concerning the role of genetics in determining life span, and this holds promise of extending the lives of animals and humans. Explains genetics, DNA, and genetic theories of aging. Illustrates the genetic processes behind cellular aging, and shows how genes affect life span. Discover the reasons why cells age and why a certain enzyme can effectively turn back the hands of our "biological clock."
Part of the "Inside the Living Cell" series. Shows how DNA replicates; how copy errors occur and are subsequently corrected by repair enzymes; and how DNA is compressed into chromosomes, making mitosis and cell division possible. Provides an overview of DNA structure, replicating DNA, mutations that change the genetic code, proofreading and repair, and the stages of mitosis.
Part of the "Inside the Living Cell" series. Illustrates how genetic instructions carried on DNA are transcribed into RNA, leading to the production of specific enzymes that control the thousands of biochemical processes occurring in living cells. Provides an overview of the protein basis of life, enzymatic reactions, amino acids and DNA, how proteins are built, and gene activation.
A mutagen is any agent (physical, chemical, or biological) capable of altering the structure of DNA within human cells. This program explores how some mutations are a natural process resulting from errors in the copying and repair of DNA and how some mutagens naturally exist in the world (e.g., UV radiation, cosmic rays, and some radioactive isotopes). Others are specific chemicals that have been synthesized for use in manufacturing or other industries. Mutagens may also arise during the metabolism of certain foods. In many cases mutagens may also lead to the development of cancers.
Meet a chemist who owns his own business that develops synthetic DNA molecules designed to reprogram cells and help cure diseases. Hear the importance of writing, communication skills, and creativity to becoming a successful chemist. Part of the "Career Connections" series.
In this episode, host Emily Graslie explores de-extinction. However, for this to happen scientists must find viable DNA. They must also account for environmental effects on a developing fetus. Part of "The Brain Scoop" series.
How do spiders make their webs? Turns out it’s in their DNA. Spider expert and American Museum of Natural History curator Cheryl Y. Hayashi discusses her research into spider silk.
It's the decade of Ronald Reagan and Margret Thatcher; cold war and glasnost; big beats, big hair and fashions that seemed like a good idea at the time. The inventions of the 1980s have people looking inward at DNA and outward to the far reaches of space. Featured inventions include: the internet, DNA profiling, the nicotine patch, MIR Space Station, and the endoscopy capsule.
Part of the "Visualizing Cell Processes" series. Includes the following modules: "The Protein Nature of Life," "Protein Structure," "Transcription," "Translation and Protein Synthesis," "Gene Regulation in Prokaryotes," "Classes of Eukaryote DNA," "Exons and Introns," "Mutations," and "Renegade DNA: The Viruses."
Join the Amoeba Sisters as they explain gene and chromosome mutations and explore the significance of these changes. A mutation is a change that occurs in a DNA sequence, either due to mistakes when the DNA is copied or as a result of environmental factors. Part of "The Amoeba Sisters" series.
Updates the five kingdoms classification scheme with the latest understanding of life's organization based on DNA, fossil, and biochemical evidence, reorganizing all life into three great branches: Archaea, Bacteria, and Eucarya. Shows concise animations and superb microscope footage of primitive cells.
James Watson and Francis Crick collected and interpreted key evidence to determine that DNA molecules take the shape of a twisted ladder—a double helix. The film presents the challenges, false starts, and eventual success of their bold chase. Watson relates what those early days in the Cavendish Laboratory were like, including his friendship with Crick and their shared ambition and passion. Rarely seen archival footage is combined with interviews with some of today’s leading scientists to bring this landmark discovery and all of its implications to life.
To what degree are we genetically programmed with certain traits and abilities? Looks at recent technologies and scientific discoveries and considers the classic "nature versus nurture" discussion. Segments cover identical twins, the science of biotechnology, and the genetic inheritance of working dogs. Investigates the similarities in personality shared by identical twins. Explains how recent breakthroughs in genetics research and DNA have created new ways to solve crimes, breed (clone) animals, and extend human life. Discusses cross-species cloning, human cloning, and gene therapy. Shows how assistance and search-and-rescue dogs can be taught to overcome their inborn instincts and fear.
Showing collections 1 to 2 of 2
Biology related concepts
A collection containing 59 resources, curated by Benetech
Resources to teach younger students about animals
A collection containing 58 resources, curated by DIAGRAM Center
