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Draw the 4 nucleotides of DNA in Figure 1, Page 144 Label the sugar parts (S), phosphate parts (P) and basesadenine (A), thymine (T), guanine (G), and cytosine (C) Use color Name______________________________ 4/17/17 Period ___ Skills Worksheet Directed Reading A Read Ch. 6, Sect. 1, Pg. 144-147 of text to find answers Section: What Does DNA Look Like? _____ 1. What are chromosomes made of? a. inherited characteristics c. cells and structures b. generations d. protein and DN _____ 2. What is the name of the material that determines inherited characteristics? a. deoxyribonucleic acid c. RNA b. ribosome d. amino acid THE PIECES OF THE PUZZLE Draw the DNA molecule in Figure 4, Page 146 Label the sugar parts (S), phosphate parts (P), and bases (A,T,C,G) Use color 3. The subunits that make up DNA are called a. phosphates. c. amino acids. b. nucleotides. d. bases. 4. What two things must DNA be able to do? _____________________________________________________ _____________________________________________________ 5. Why must DNA be able to be copied? _____________________________________________________ _____________________________________________________ 6. Scientists were surprised about how much the DNA molecule could do, because they thought only ____________________ molecules could give instructions and be copied during cell division. 7. What three things is a nucleotide made of? 15. What two things did this model eventually help explain? _____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________ ______________________________________________________ 8. What are the four bases of a nucleotide? DNA’S DOUBLE STRUCTURE 16. The twisted ladder shape of DNA is called a(n) _____________________________________________________ _____________________________________________________ ______________________________________________________ 9. What four letters stand for the four types of bases? _____________________________________________________ 10. According to Chargaff’s rules, the amount of ______________________ 17. What molecules form the sides of the ladder? _____________________________________________________ _____________________________________________________ 18. What are the rungs of the DNA ladder made of? _____________________________________________________ _______________________ always equals the amount of thymine. 11. According to Chargaff’s rules, the amount of guanine always equals the amount of _______________________. 12. Rosalind Franklin used a process known as _______________________ to make images of DNA molecules. 13. What shape did Franklin’s images show? _____________________________________________________ 14. What did James Watson and Francis Crick’s model of DNA look like? _____________________________________________________ _____________________________________________________ Match the correct description with the correct term. Write the letter in the space provided. _____ 19. pairs with adenine _____ 20. pairs with guanine a. cytosine b. thymine