QUIZ 1. What is not a part of a DNA-based nucleotide? a. Ribose molecule b. Phosphate group c. Deoxyribose molecule d. Nitrogenous base Answer: a. There is just one type of sugar molecule in a DNA nucleotide and this is deoxyribose and not ribose, which is another type of fivecarbon sugar. 2. What would not be seen in a DNA nucleoside? a. Adenine b. Thymine c. Deoxyribose d. Phosphate Answer: d. A DNA nucleoside is just a nitrogenous base like adenine and thymine plus deoxyribose but not the phosphate group. If a phosphate group is associated with this, it is referred instead as a nucleotide. 3. What is the carbon number on the deoxyribose sugar that has the free phosphate end associated with the end of a DNA strand? a. One-prime b. Three-prime c. Four-prime d. Five-prime Answer: d. It is the five-prime end that has the free phosphate group associated with it at the end of the DNA strand. The three-prime end has a free hydroxyl group.
136
