OnScreen DNA Modelfor iPad & for iPhone & iPod Touch
OnScreen Science, Inc., 46 Wallace St., Somerville, MA 02144 — 800-617-6416 — firstname.lastname@example.org
With OnScreen DNA™ expect to teach all of your students
- how the co-ordinated action of enzymes is necessary for basic processes involving DNA
- how portions of the DNA strands separate and unwind to serve as templates for RNA or DNA daughter strand construction
- how RNA and daughter strands are constructed one nucleotide at a time and the direction in which this proceeds
- that either strand may contain genes and which direction genes are read on each strand
- how primer RNA is required during DNA replication
- why Okazaki fragments are required on the lagging strand
- how primer RNA is replaced and Okazaki fragments are joined together
- how the enzyme pyrophosphatase is essential for DNA-based life
- how telomerase solves the end problem of DNA replication
and much more (really).
OnScreen DNA Pro™ ($24.99)
The Pro edition adds activities in which the user is empowered and challenged to take active control of transcription and replication. The buttons on the enzyme control panels are now "hot" and used to activate the proper enzymes. The user also has to select the correct nucleotide and drag it to the appropriate spot for chain-building.
The ultimate test of understanding a process is whether you can actually carry out the necessary steps yourself. In addition to the simulations in which events proceed automatically, the student is now presented with simulations which require student actions.
Which enzyme needs to act next to keep the process going? What nucleotide needs to be added next to the chain that is being constructed? RNA or DNA? The Pro edition allows the user to make these choices and demonstrate mastery of the DNA processes in a way that can only come with a virtual hands-on simulation. At the same time, every correction of a false move takes the learner closer to full understanding of how a process proceeds.
The Pro version also empowers teachers. You can, for example, challenge your students to use OnScreen DNA Pro to create a strand of messenger RNA that codes for your choice of one of the several amino acid sequences possible to obtain from the 35-base-pair DNA molecule of the OnScreen DNA model. They then must mark the beginning and end points of the gene for that sequence on the proper DNA template strand and then proceed with the transcription step by step.
Depending on your particular situation and needs, the Pro edition might be overkill. The choice is up to you. And should you decide later that you'd like to upgrade, the price you paid for your edition can be applied to the purchase of a higher edition.