10SCI Quiz: Structure and Discovery of DNA (LI3)

Who first described the double helix structure of DNA?

• Friedrich Miescher

• Phoebus Levene

• Erwin Chargaff

• James Watson and Francis Crick

What are the three components of a nucleotide?

• Phosphate Group, Ribose Sugar, Nitrogenous Base

• Phosphate Group, Deoxyribose Sugar, Nitrogenous Base

• Phosphate Group, Glucose, Nitrogenous Base

• Phosphate Group, Fructose, Nitrogenous Base

Which nitrogenous base pairs with Thymine (T) in DNA?

• Adenine (A)

• Guanine (G)

• Cytosine (C)

• Uracil (U)

What did Friedrich Miescher discover in 1869?

• The double helix structure of DNA

• The basic components of DNA

• A phosphorus-rich substance in cell nuclei

• Chargaff's Rules

What did Erwin Chargaff discover about the amounts of adenine and thymine in DNA?

• Adenine always equals guanine

• Adenine always equals cytosine

• Adenine always equals thymine

• Adenine always equals uracil

What technique did Rosalind Franklin use to reveal the helical structure of DNA?

• X-ray diffraction

• Electron microscopy

• Nuclear magnetic resonance

• Mass spectrometry

What did Watson and Crick's model explain about DNA?

• The discovery of nuclein

• The fixed order of bases

• DNA replication and genetic information transmission

• The amounts of adenine and thymine

Which of the following is NOT a nitrogenous base found in DNA?

• Adenine

• Thymine

• Uracil

• Cytosine

Which scientist's work was crucial in understanding DNA's base pairing?

• Friedrich Miescher

• Phoebus Levene

• Erwin Chargaff

• Rosalind Franklin

What did Rosalind Franklin's X-ray diffraction reveal about DNA?

• The amounts of adenine and thymine

• The helical structure of DNA

• The basic components of DNA

• The discovery of nuclein