DNA Structure

What do the letters DNA stand for?

• deoxyoribose nitrogen acid

• deoxyoribosenucleic acid

• Amino Acid

What are the four nitrogen bases of a nucleotide?

• Cytosine, Guanine, Uracil, Nucleus

• Thymine, Adenine, Uracil, Guanine

• Adenine, Thymine, Cytosine, Guanine

Which scientists determined the shape of DNA

• Francis Crick & James Watson

• Alfred Hershey and Martha Chase

• Rosalind Franklin & Maurice Wilkins

The two bases that are pyrimidines are:

• Cytosine & Guanine

• Thymine & Cytosine

• Cytosine & Adenine

• Adenine & Thymine

The two bases that are purines are:

• Guanine & Thymine

• Adenine & Thymine

• Guanine & Cytosine

• Adenine & Guanine

The nitrogen base, sugar (deoxyribose) and phosphate are the basic structure of a

• DNA Polymarse

• Nucleotide

• Nitrogenous base

• Sugar Backbone

The bases are paired by what type of bond along the axis of the molecule?

• Hydrogen

• Nitrogen

• phosphate

How many hydrogen bonds connect adenine and thymine?

• 1

• 2

• 3

• 4

How many hydrogen bonds connect cytosine and guanine?

• 1

• 2

• 3

• 4

Watson and Crick discovered that the shape of DNA was a

• Double helix

• 2 Strands of Nucleotides

• twisted ladder

• All of the above