12.2 The Structure of DNA

Who were the first scientists to build a model of a DNA molecule?

• Larry, Moe, and Curley Joe

• Watson and Crick

• Watson and Holmes

• Superman and Batman

The building block of nucleic acids are nucleotides.  Nucleotides are composed of a sugar, a phosphate group, and a _________________ base.

• oxygen
• hydrogen
• nitrogen
• carbon

The backbone of a DNA molecule is made from a ______________ and a _______________ group.

• lipid, carbon
• sugar, phosphate
• nitrogen, oxygen
• nitrogen, sulfur

What are the four nitrogen bases found in DNA?

• adenine, thymine, guanine, cytosine

• adenine, lysine, prolene, guanine

• arganine, cytosine, lysine, purine

• lysine, cytosine, lucine, guanine

The shape of the DNA molecule is a double _________________.

• "S"

• helix

• rope

• curve

The sugar in DNA is_____________.

• sucrose

• glucose

• deoxyribose

• fructose

What are the building blocks for DNA?

• carbohydrates
• nucleotides
• lipids
• proteins

Which one of the following nucleotide pair bonds would be found in a DNA molecule?

• adenine-guanine
• guanine-cytosine
• adenine-cytosine
• cytosine-uracil

A DNA nucleotide may be made up of a phosphate group, along with _____.

• deoxyribose sugar and uracil
• ribose sugar and adenine
• deoxyribose sugar and thymine
• ribose sugar and cytosine

Franklin used x-ray crystallography to determine the shape of the DNA molecule is

• a cloverleaf
• a braided rope
• a pleated sheet
• a twisted ladder