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Unformatted text preview: BIO 244 Dr. Gaillard Spring 2008 Chapter 4 Review Questions 1. What are the three components of a nucleotide? A phosphate group, sugar, and a nitrogenous base. (pg. 75) 2. What are purines and pyrimidines? Which nitrogenous bases are in each category? A purine is a class of small, nitrogen-containing, double-ringed bases (guanine, adenine) found in nucleotides 3. Explain the difference between ribose and deoxyribose. Ribose has OH- and it is more reactive. Deoxyribose has an H and is more stable (notes) 4. In what ways do DNA and RNA differ? The pyrimidine base thymine does not exist in RNA. Instead, RNA contains the closely related pyrimidine base uracil. The sugar in the sugar-phosphate backbone of RNA is ribose, not deoxyribose as in DNA. 5. What are the rules for base pairing between the nitrogenous bases of different nucleotides A=T A=U with RNA G=C with DNA 6. Describe the structure of DNA. What is its shape? What is meant by the term, “sugar- phosphate backbone?” What are the major and minor grooves? What is meant by the term, “anti-parallel?” 7. What are the dimensions (measurements) of a DNA molecule?...
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This note was uploaded on 12/05/2010 for the course BIO 234 taught by Professor Gaillard during the Spring '10 term at Sam Houston State University.
- Spring '10
- cell biology