Structure of DNA

Each nucleotide in a DNA molecule consists of a

• sulfur group, a five carbon sugar molecule, and a nitrogen base

• phosphate group, a six carbon sugar molecule, and a nitrogen base

• phosphate group, a five carbon sugar molecule, and an oxygen base

• phosphate group, a five carbon sugar molecule, and a nitrogen base

In 1953, Watson and Crick built a model of DNA with the configuration of a

• single helix

• double helix

• triple helix

• circle

Which of the following describes the base-pairing rules in DNA?

• Purines pair only with purines

• Pyrimidines pair only with pyrimidines

• Adenine pairs with guanine, and thymine pairs with cytosine

• Adenine pairs with thymine, and cytosine pairs with guanine

Which of the following researchers took key photographs of DNA?

• Watson

• Crick

• Franklin and Wilkins

• Chargaff

Pyrimidine found in DNA

• Double helix

• Cytosine

• Watson and Crick

• Adenine

Forms hydrogen bonds with thymine

• Double helix

• Cytosine

• Watson and Crick

• Adenine

Showed that A=T and C=G in DNA

• Chargaff

• X-ray diffraction

• Adenine

• Watson and Crick

Spiral shape of DNA

• Double helix

• Cytosine

• Watson and Crick

• Adenine

Credited with discovering the structure of DNA

• Chargaff

• X-ray diffraction

• Adenine

• Watson and Crick

Method used to take photographs of molecules

• Chargaff

• X-ray diffraction

• Adenine

• Double helix