DNA Structure and History Review

What does DNA stand for?

• Deoxyribonucleic acid

• Deoxyribose acid

• Deoxynucleic acid

• Deoxyribose nucleotide

What is the 3D structure of DNA called?

• Single helix

• Double helix

• Triple helix

• Quadruple helix

Which nitrogenous base pairs with Adenine in DNA?

• Cytosine

• Guanine

• Thymine

• Uracil

What is the role of histones in DNA structure?

• They form the sugar-phosphate backbone

• They help pack and condense DNA

• They code for proteins

• They are nitrogenous bases

What type of bond holds the nitrogenous bases together in DNA?

• Ionic bonds

• Covalent bonds

• Hydrogen bonds

• Metallic bonds

Who was the first person to observe DNA and name the new chemical substance he found?

• Levene

• Franklin

• Miescher

• Watson

What did Levene discover about nucleotides?

• They are composed of amino acids

• They are composed of a phosphate group, a sugar, and a base

• They are composed of proteins

• They are composed of lipids

What significant contribution did Franklin make to the study of DNA?

• She discovered the double helix structure

• She produced the first image of DNA using X-ray crystallography

• She discovered nucleotides

• She formulated Chargaff's rule

What is Chargaff's rule regarding the composition of DNA?

• The number of adenine is equal to the number of guanine

• The number of purines is equal to the number of pyrimidines

• The number of cytosine is equal to the number of thymine

• The number of sugars is equal to the number of bases

What did Watson and Crick discover about the structure of DNA?

• It is a single helix

• It is a triple helix

• It is a double helix

• It is a quadruple helix

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