Storing and using Genetic Information Flashcards
1
Q
double helix structure
A
DNA is composed of 2 chains of nucleotides
deoxyribose sugar, phosphate and base
nucleotides connect using carbons 3 and 5 on the sugar
one strand runs 3’ to 5’ and the other runs 5’ to 3’
2
Q
DNA replication
A
semi- conservative and bi-directional
half of DNA is old and the other is new, copied in opposite directions
DNA helicase unzips DNA strand
DNA polymerase adds new nucleotides building a complementary strand
lagging strand forms discontinuous fragments (okazaki fragments) joined by ligase
3
Q
DNA transcription
A
set of 3 bases is called a codon which codes for a specific amino acid
sections of RNA called exons are removed leaving introns (non-coding region) producing mRNA
