I recently discovered this model from the Concord Consortium. I love it! Students can view the processes of transcription and translation for the molecule in its original sequence. The ability to see these steps illustrated so clearly will definitely be helpful to students who can find this topic to be challenging because of its abstractness. They are also able to edit the DNA molecule. By selecting the Edit DNA button they can type in changes to the DNA sequence. They can also click directly on a nitrogen base (ATGC) and select the type of mutation they want to create in the molecule. They can choose a substitution, deletion or insertion mutation. They can then transcribe and translate their new DNA strand to analyze changes in the RNA and protein (amino acid) sequence. Another cool feature is that the model shows protein models that illustrate which amino acids are hydrophobic and which ones are hydrophilic.
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This video demonstrates how to calculate the percent water in copper (II) sulfate pentahydrate by analysis of its chemical formula. This video shows an experiment comparing the activity of three metals; Cu, Zn and Mg. The metals are first tested hydrochloric acid, and then hot water to determine their levels of activity. Answer: DNA is copied during interphase (S phase) before mitosis and just before meiosis. Explanation:In human, mitosis produces diploid daughter cells which have the same number of chromosomes as the parent cell. Meiosis produces gametes (sperm or egg) which are haploid, meaning these cells have half the number of chromosomes as body cells such as skin cells. DNA is copied using a process called semiconservative replication. The video below shows how DNA is copied and then discusses the processes by which RNA and proteins are made. I have my students use computer models including "Building DNA" by Gizmos and an animated review of DNA replication. Students are asked to evaluate strengths and weaknesses of the models. Lessons on this topic can connect with NGSS crosscutting concepts such as "Systems and Sytem Models" by using computer models and "Structure and Function" by focusing on how the shape and structure of DNA allows the molecule to store genetic information. Hope this helps! This video shows a paper chromatography experiment conducted to separate the different pigments present in a wet erase marker. This video shows a classic biology experiment using eggs to illustrate the process of osmosis. This video shows moving chloroplasts in Anacharis plants. The movement is due to cytoplasmic streaming. This video basic chemistry concepts used in an introductory high school biology class. |
Noel PaullerThank for visiting my blog where I post thoughts from the random corner of the universe which is my brain. Archives
October 2022
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