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Biology 102 Chapter 12 Molecular Genetics Name ________________________________ Date _______________ Period ______ Section 1: DNA: The Genetic Material In your textbook, read about nucleotides, then label the diagrams below using these choices: cytosine guanine phosphate purine pyrimidine sugar 1. _________________________ 2. _________________________ 3. _________________________ 4. _________________________ 5. _________________________ 6. _________________________ In your textbook, read about DNA structure. Write the term or phrase that best completes each statement. Use these choices: adenine (A) double ring nucleotides chromosome genetic material purine cytosine nitrogenous bases single-ring double helix nucleic acid 7. ______________, guanine (G), cytosine (C), and thymine (T) are the 4 ______________________ in DNA. 8. In DNA, ____________________________ always forms hydrogen bonds with guanine (G). 9. The sequence of ____________________________ carries the genetic information of an organism. 10. Chargaff's data states that the # of ___________________ bases equals the # of pyrimidine bases in DNA. 11. The twisted ladder shape of DNA is called a ____________________________. 12. DNA is the ____________________________ of all organisms. 13. The pyrimidine bases have a ____________________________ structure. 14. The purine bases have a ____________________________ structure. 15. DNA and RNA are the two ____________________________ found in living cells. 16. DNA supercoils to make up the structure known as a ____________________________. Section 1: DNA: The Genetic Material After reading the section in your textbook, answer the following question. 17. Apply Chargaff's rule to decide how many guanine bases a length of DNA will have if it has 26 cytosine bases. Explain. __________________________________________________________________________ _______________________________________________________________________________________