Exploring DNA Structure and Base Pair Rules

Where is DNA found within the cell?

• Cytoplasm

• Ribosome

• Nucleus

• Mitochondria

What is the functional unit of DNA called?

• Gene

• Chromosome

• Nucleotide

• Base pair

What is the structure of DNA described as?

• Single helix

• Double helix

• Triple helix

• Quadruple helix

What are the components of the DNA backbone?

• Phosphate and proteins

• Sugar and nitrogenous bases

• Phosphate and nitrogenous bases

• Sugar and phosphate

How are the two strands of DNA oriented?

• Parallel

• Perpendicular

• Random

• Anti-parallel

Which nitrogenous base pairs with adenine?

• Cytosine

• Guanine

• Thymine

• Uracil

What is a nucleotide composed of?

• Phosphate, protein, and nitrogenous base

• Sugar, protein, and nitrogenous base

• Phosphate, sugar, and protein

• Phosphate, sugar, and nitrogenous base

Which bases are classified as purines?

• Thymine and cytosine

• Adenine and guanine

• Guanine and cytosine

• Adenine and thymine

Who discovered the base pairing rules?

• Watson

• Crick

• Chargaff

• Franklin

How many hydrogen bonds connect cytosine and guanine?

• One

• Two

• Three

• Four