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Download Cytosine – ______ Sugar
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Transcript
# ___ Introduction to DNA Name: Class: Date: 1. What is a nucleotide? 2. Draw a guanine nucleotide based on Figure 12-5. Label each part of the nucleotide. 3. The following diagram represents part of a strand of DNA. Color its parts as indicated below: Adenine – _________ Cytosine – _________ Sugar – grey Guanine – _________ Thymine – _________ Phosphate – Note: The oval circles are still part of the sugar, but are drawn in to represent where the base is attached. Diagram from http://members.aol.com/Cappuccinno21/Biochem/dna.html 4. Look at the diagram. What do the lines connecting the two strands represent? (Why are there three lines connecting the strands in some instances and only two in others?) 5. Look at the single strand of DNA below and write in the complementary base pairs in the second strand below. 5’ 3’ A T T G C T T G A G A A 3’ 5’ 6. If 31.5% of a cell’s DNA is composed of adenine nucleotides, what are the percentages of the other three types of nucleotides? Use Chargaff’s Rule. See the back page for the Role of DNA.
