Watch the video linked below.

https://www.pbslearningmedia.org/resource/biot11.sci.life.gen.structureofdna/the-structure-of-dna/ (Links to an external site.)

Submit answers to the following questions.

  • The DNA double helix can be compared to a twisted ladder. What makes up the rungs of the ladder? What makes up the sides of the ladder? What holds the structure together?
  • Explain what “complementary base pairing” means. Given the nucleotide sequence A-T-G-G-C-A, what would be the sequence on the complementary strand?
  • How does the molecular structure of base pairs ensure that two strands of DNA are complementary?
  • Many proteins “contact” or bind with DNA. Where does DNA-protein binding typically occur,and why?

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