Which of the following statements best summarizes structural differences between DNA and RNA?
a. RNA is a protein while DNA is a nucleic acid. b. DNA is not a polymer, but RNA is. c. DNA contains a different sugar than RNA. d. RNA is a double helix, but DNA is not. e. DNA has different purine bases than RNA. 19. What happens when bacteriophage are grown in radioactive phosphorous? a. Their DNA becomes radioactive. b. Their proteins become radioactive. c. Their DNA is found to be of medium density in a centrifuge tube. d. They are no longer able to transform bacterial cells. e. They transfer their radioactivity to bacterial chromosomes during infection. 20. What kind of chemical bonds are found between paired bases of the DNA? a. Hydrogen b. Ionic c. Covalent d. Sulfur-Sulfur e. Phosphate 21. Which of the following descriptions best fits the class of molecules known as nucleotides? a. A nitrogen base and a phosphate group only. b. A nitrogen base and a five-carbon sugar only. c. A nitrogen base, a phosphate group, and a five-carbon sugar. d. A five-carbon sugar, a phosphate grou
