DNA structure Flashcards
1
Q
6 key features of DNA structure
A
- Double stranded
- Double helix structure
- DNA monomers (nucleotides) build up DNA molecules (polynucleotides)
- Sugar phosphate backbone
- Chains of nucleotides run antiparallel
- Bases on opposite strands have complementary base pairing
2
Q
What is sugar phosphate backbone?
A
Phosphodiester bonds between phosphates and sugar
3
Q
What is name of bonds that joins nucleotides?
A
Phosphodiester bonds
4
Q
Which carbon atoms are involved in bond between adjacent nucleotides?
A
5’ and 3’ carbon atoms of deoxyribose sugar
5
Q
What do DNA monomers consist of?
A
Phosphate group, deoxyribose sugar, base (A, T, C, G)
6
Q
Why are there equal amounts of A&T and then G&C in DNA molecule?
A
A always bonds to T (2 H bonds) and G always bonds to C (3 H bonds). This is due to complementary base pairing
7
Q
Define polymorphism
A
A mutation present in 1% or more of population
