DNA Structure and Base Pairing

The video tutorial explains the structure of DNA as a nucleic acid composed of nucleotides: adenine, guanine, cytosine, and thymine. It distinguishes between purines (adenine and guanine) and pyrimidines (cytosine and thymine), noting that thymine is replaced by uracil in RNA. The tutorial covers DNA base pairing rules, where adenine pairs with thymine and guanine pairs with cytosine, and introduces a mnemonic to remember these pairings. It also discusses the directionality of DNA strands, emphasizing the 5 to 3 prime orientation.

Which of the following is NOT a nucleotide found in DNA?

• Adenine

• Guanine

• Cytosine

• Uracil

Which nucleotide is replaced by uracil in RNA?

• Adenine

• Guanine

• Cytosine

• Thymine

What is the base pairing rule for adenine in DNA?

• Adenine pairs with cytosine

• Adenine pairs with uracil

• Adenine pairs with thymine

• Adenine pairs with guanine

Which mnemonic can help you remember the DNA base pairing rules?

• All Cats Can Grow

• All Cats Grow Tall

• All Tigers Can Grow

• All Tigers Grow Tall

In which direction do DNA strands move?

• 5 to 5 prime

• 3 to 3 prime

• 3 to 5 prime

• 5 to 3 prime