U5 Bell Work DNA Structure Quizziz

(19) Which of the following is a nucleotide found in DNA?

• a. adenine + phosphate group + thymine
• b. cytosine + phosphate group + guanine
• c. deoxyribose + phosphate group + polymerase
• d. deoxyribose + phosphate group + cytosine

(20) Because of base pairing in DNA, the percentage of

• a. adenine molecules in DNA is about equal to the percentage of guanine molecules.
• b. thymine molecules in DNA is about equal to the percentage of adenine molecules
• c. adenine molecules in DNA is much greater than the percentage of thymine molecules.
• d. cytosine molecules in DNA is much greater than the percentage of guanine molecules.

23 What structural problem prevents adenine from pairing with guanine?

• a. The bases are both short.
• b. They lack phosphate groups.
• c. They lack the deoxyribose group.
• d. The bases are both long.

28. Which scientist(s) figured out that the shape of a DNA molecule is a double helix?

• a. Hershey and Chase
• b. Griffith
• c. Watson and Crick
• d. Franklin

29. Which scientist made x-ray diffraction photos of DNA?

• a. Franklin
• b. Chargaff
• c. Watson
• d. Avery