Garland Science ; DNA was known to be a long polymer composed of only four types of subunits, which resemble one another chemically. Early in the s, DNA was first examined by x-ray diffraction analysis, a technique for determining the three-dimensional atomic structure of a molecule discussed in Chapter 8. The early x-ray diffraction results indicated that DNA was composed of two strands of the polymer wound into a helix.
Allow students to watch the clip before making any statements about the lesson. After the clip ends, inform students that the lesson will focus on one of the most significant coded messages of all time, the DNA code.
Provide a brief summary of the movie in order to frame its relevance to the lesson on the DNA code. Inform students that the student learning targets for this lesson are: I understand the basic structure of DNA. I can explain the events and products of DNA replication. Guided notes provide greater support for the different learning styles of students.
Guided notes also better ensures that students will leave with the information I intend for them to capture. I vary the format of the guided notes from time to time to help students learn how to create notes using different formats.
The notes format for this lesson is a graphic organizer. Review the structure of the nucleotide as the monomer of the DNA molecule. Look for students to recall this information from the lesson on macromolecules.
Use the terms monomer and polymer, reminding students that these terms both have prefixes which means that both terms should already be noted on their vocabulary maps.
What molecules make up the sides of the DNA molecule? What molecules make up the rungs of the DNA ladder? What is the base pair rule? After instruction on the structure and function of DNA, introduce the term, replication.
Explicit vocabulary instruction is important for building academic literacy and it includes instruction on not only content specific but non-content specific terms.
Make sure that students know the meaning and synonyms of key terms. At the end of the timed period, emphasize the DNA replication occurs so that cells are able to pass on the code or instructions to offspring cells. Use a non-science metaphor to help all learners gain a sense of the reasons why DNA code is replicated.
For example, use a recipe as an example. Explain that if someone wants to make my famous German chocolate cake, that person will need a copy of the recipe from me first before attempting to replicate my famous German chocolate cake.Writing About Biology Bioscene 23 Writing About Biology: How Rhetorical Choices Can Influence the Impact of a Scientific Paper.
Rosalind Franklin was a scientist whose contributions to the discovery of the shape of the DNA molecule went uncredited for many years. Summary - DNA and DNA Extraction. DNA is composed of nucleotides bonded to a sugar-phosphate backbone.
Double stranded DNA forms a double helix structure. The DNA double helix coils up into compact structures called chromosomes. Small segments of the chromosome that encode a single protein are called genes.
Be the first to write a. Genetics relies on chemistry to explain phenomena related to the field. The structure of DNA relies on chemistry.
In fact, when James Watson and Francis Crick discovered the structure of DNA, they did so by building models based on the laws of chemistry. DNA Essay requires careful picking of facts that optimally support your ideas and zeroing in on a basic structure one needs to work on. Second comes the writing stage where the chief concern is to transform your ideas into well composed sentences.
This calls for precision in terms of language, grammar and comprehension skills. DNA & RNA Summary. Authors • 2 min read Structure of DNA. DNA stands for deoxyribonucleic acid. DNA is a double stranded molecule made up of elongated chains of sub-units called nucleotides.
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