Biochem Day 5: AP Biology Task Verbs: Construct/Draw and Support a Claim. Pgs 23-34 in Stuff of Life

The AP Exam will ask you to demonstrate your knowledge (easy) in very specific ways (difficult). The first step to doing this well is to understand what you’re being asked to do. In this unit we will practice more specifically with "Support a Claim" and "construct Create a diagram, graph, representation, or model that illustrates or explains relationships or phenomena. Labels may or may not be required.Support a Claim:Provide reasoning to explain how evidence supports or qualifies a claim The next section is the hardest in this unit. In order to demonstrate your understanding you must truly "get it" at a deep level. Since these processes are so microscopic that they are invisible to us "construct allows us to create and analyze visual representations of the process to clearly understand what is taking place. We will discuss how we know our drawings are correct even if we can't see what we're looking at in class. "Support a Claim" is arguably one of the most relevant and necessary skills in our generation. With the extraordinary access to information (both factual and misinformation) knowing how to read the data and support a claim is essential to being scientifically literate. Read pages 23-34 and answer the questions. You've got this! Erwin Chargaff was a researcher who analyzed the DNA of many different organisms. Using quantitative measurements he found the following data:1. From this data Chargaff, and several other researchers including the eventual Nobel Prize winners Watson, Crick, and Wilkins made the claim that Adenine (A) and Thymine (T) always paired together while Guanine (G) and Cytosine (C) were a match regardless of which organism the DNA was taken from. Use the data provided to support this claim. Draw the structure and organization of DNA. You can feel free to make a key to identify parts or simply label important pieces. The question of how DNA replicates led to some really interesting experiments. Imagine we have a double strand of DNA that has been colored blue and an abundance of free nucleotides that have been colored red (we have the ability to add markers, colors, or radioactive elements onto molecules in order to visually see them and track where they go). Construct a diagram to show what would happen if DNA replicated in a conservative manner (basically the copy is just a photocopy of the original. The question of how DNA replicates led to some really interesting experiments. Imagine we have a double strand of DNA that has been colored blue and an abundance of free nucleotides that have been colored red (we have the ability to add markers, colors, or radioactive elements onto molecules in order to visually see them and track where they go). Construct a diagram to show what would happen if DNA replicated in a dispersive manner (random segments of original template are replaced with free nucleotides and free nucleotides make sections with interspersed original). The following is an image of the actual result of replication with different colored DNA. The blue is the original, the yellow are the free nucleotides. Support the Claim that DNA replication is neither conservative or dispersive. Put the following steps of DNA replication in order first The cell receives a chemical message to divide second The DNA unwinds and initiators find the origin for replication third Helicase enters and opens the strand of DNA fourth temporary RNA starts the binding so that DNA polymerase can match bases in the opening fifth RNA primers are removed and the copied strands are proof read for errors