DNA Double Helix Flashcards
Who discovered the Double Helix model?
Watson and Crick (1953)
Watson and Crick determined that their DNA double helix model was a?
polymer with a backbone of repeating sugar and phosphate groups
What is a polymer?
made up of monomers which are nucleotides
What are the forms of bases in the double helix model?
A, G, C, and T
what are the bases dependent on?
dependent on physiological pH and thus specific hydrogen bonds form between pairs.
How did they discover the double helix structure of DNA
through X-ray diffraction, rosalind Franklin
What is the diameter of the double helix structure?
2 nm
What does the diameter allow and not allow?
distance is too small for two purines and two large for two pyrimidines
just right for a purine and a pyrimidine
How are pyrimidine-purine pairs held together?
by hydrogen bonds
What bases pair together?
A pairs with T, and C with G
True or False: Base sequence of one chain determines the sequence of the other chain.
True
How many nucleotides are per turn?
10
the width of each base pair is how long
0.34 nm
how long is each complete turn?
3.4 nm long
what is the anti-parallel orientation?
left side is 5 ->3 (5 on top and 3 on bottom)
right side is 3 ->5 (3 on top and 5 on bottom)
