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Name _____________________________ Period _____ Journey Into DNA Go to the following website: www.pbs.org/wgbh/nova/genome/dna.html# Click on the flash version of the graphic and wait for it to load. Read each paragraph about a different aspect of DNA. Complete the worksheet section for that slide. When you have finished reading and have answered the question(s), click on the + magnifying glass to go to the next slide. Continue doing this until you have gone through all 15 slides. Main page: What is the structure of DNA? Human body: How many cells does the human body contain? What is the only type of cell in the human body that contains no nucleus and therefore no nuclear DNA? Intestines: Is the DNA code from cell to cell in the human body the same? Cells: How are new types of cells produced? Nucleus: The nucleus acts as the control center for the cell, what 3 jobs does it have? Human genome: The human genome is comprised of two sets of ________ chromosomes. About _______% of the genome consists of sequences that have no known function. Within the other 3% are an estimated ___________ genes. Chromosome: Draw what a single chromosome looks like. Chromosome banding: Each of the 23 chromosome types has a ____________ ___________ ___________. Name _____________________________ Period _____ Gene: A single gene can range in length from ________________________. Chromatin loops: There is a lot of DNA within the nucleus-about _________feet if you could unravel it and stretch it out. Chromatin scaffold: Chromatin refers to ___________________ that help organize the long DNA molecule. Nucleosome: Double helix: Which two scientists used Rosalind Franklin’s photo 51 to piece together the first accurate model of DNA? The structure of DNA resembles a _____________ ______________. DNA bases: Name the base for each abbreviation: T= A= C= G= A always pairs up with _____________. C always pairs up with _____________. One nucleotide: The sides of the DNA ladder consist of a long string of __________________ and ___________________ molecules, to which the bases are attached. Each sugar-phosphate-base combination is called a ______________________. Molecular structure: How many sequences of bases exist in the human genome? Scientists have completed determining the sequence of the human genome, what are they working on now?