Bellringer: UNIT 7: DNA Structure & Replication DAYSHEET 79: Introduction to DNA Structure. 1. Get out your technology and go to

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1 UNIT 7: DNA Structure & Replication DAYSHEET 79: Introduction to DNA Structure Name: Biology I Date: Bellringer: 1. Get out your technology and go to 2. Click the Biomonsters Cinema link. 3. Click the CHS Academic Biology Movies link. 4. Watch the first video (Introduction to DNA Structure). Get started on your Cornell notes right away! Objective: I can identify the structure and makeup of a DNA molecule. Homework: Complete HW79

2 Activity 1: Cornell Notes Biology Objective / Essential Question: 1. DNA stands for 2. and are credited with discovering that DNA was a However, took an important x-ray photograph of DNA that showed that DNA was a double helix. 1. What is the picture below of? Who took this picture? 2. How was the discovery of the double helix an example of collaboration between scientists? How was it NOT?

3 Activity 1 Continued: Cornell Notes 3. DNA is a so it is made of Each nucleotide has 3 parts: There are four possible nitrogen bases in DNA: o = adenine o = thymine o = cytosine o = guanine 1. In the space below, draw a nucleotide using simple shapes that contains the nitrogen base adenine. Label the three parts of your nucleotide. You can use the letter A to label the adenine. 2. Which part(s) of your adenine nucleotide would be the same in a guanine nucleotide? Which part(s) would be different?

4 Activity 1 Continued: Cornell Notes 4. The from one nucleotide connects to the on another nucleotide forming the sugarphosphate backbone of DNA The 2 strands of DNA are held together by between the on either side. 1. Label the DNA molecule below using the following terms: Nucleotide Sugar Phosphate Backbone Nitrogen Bases Hydrogen Bond

5 Activity 1 Continued: Cornell Notes 5. The base pair rule states the following: o will only bond with o will only bond with Mnemonic Device: This means that if you know what bases are on one strand (side) of the DNA, you can predict what bases are on the (opposite) strand. 1. If one strand of DNA contains the nitrogen bases A T C G G A T, what nitrogen bases are on the complementary strand? 2. A DNA molecule has 100 nucleotides. There are 30 adenine nucleotides. How many of each of the following nucleotides are in the DNA molecule? Thymine Guanine Cytosine 6. DNA stores our information. The sequence of, especially, in DNA is the code for how to make, and proteins determine our. 1. Why do some people have different eye colors?

6 Activity 2: Vocabulary Mastery Directions: Pick 6 terms from the notes that you are (a) have the most difficulty with or (b) believe to be the most important terms. Write them down in the chart below and then write the class definition (from your Cornell Notes). When you are done, call your teacher over to check your definitions and get a signature. Vocabulary Term Class Definition

7 Homework 79: Mitosis & Meiosis Review Name: Biology I Date: Directions: Write if each of the following statements refer to Mitosis (MI) or Meiosis (ME) 1. This process is used to make more identical cells 2. This process is used to make somatic (body) cells 3. This process is used to make gametes (sex cells) 4. If you scratch your knee or break your bone, you ll use this process to replace the cells that die 5. This process only takes place in the ovaries or testes 6. This process makes diploid cells that have two sets of DNA 7. This process makes haploid cells that have only one set of DNA 8. This process makes cells that are genetically different 1. What does the picture to the left show? 2. Does this happen in mitosis or meiosis? 3. Why is this process important? 1. What does the picture to the left show? 2. Is this a karyotype of a male or female? 3. Is this individual genetically normal? How do you know?