Structural Biochemistry Problem Set 3: Nucleotides, DNA Structure and Interactions, Assignments of Introduction to Sociology

Download Structural Biochemistry Problem Set 3: Nucleotides, DNA Structure and Interactions and more Assignments Introduction to Sociology in PDF only on Docsity! Kyle’s Section BIBC100 – Structural Biochemistry klacy@ucsd.edu Summer 2005 Problem Set #3 1. What are the subunits called that are used by living cells to make long strands of DNA? Ans: nucleotides (deoxyribonucleotides) 2. What are the subunits called that are used by living cells to make long strands of RNA? Ans: ribonucleotides 3. What are the three parts of a nucleotide? Ans: 1) Phosphate group 2) Deoxyribose sugar 3) Nitrogenous Base 4. What are nucleosides? Ans: A nucleoside is a nucleotide without the phosphate group. 5. What are the purines? Ans: Adenine and Guanine. This refers only to the nitrogenous base part of the nucleotide. 6. What are the pyramidines? Ans: Thymine and Cytosine 7. How many hydrogen bonds are there in a C-G pair? How many in a T-A pair? Ans: C-G pairs have 3 hydrogen bonds, while T-A pairs only have 2. 8. In which direction are DNA strands synthesized? Ans: 5’ to 3’ direction 9. Are the two sides of DNA strands parallel or antiparallel? Ans: antiparallel 10. What are phosphodiester linkages? Ans: These are the links between the ribose 3’ group to the phosphate group, and also the phosphate group to the 5’ OH group of the next ribose sugar in the chain. 11. What are the two types of grooves in DNA? Ans: major groove and minor groove. 12. Are nucleotides typically positively charged or negatively charged?