science quiz april 18th
what is the 3 purposes of DNA?
1. carry genetic info to next gen
2. instructions to produce proteins
3. info to produce traits of the organism
why is DNA called a 'twisted ladder'?
its shaped like a twisted ladder or double helix shape
the sides of the twistee ladder are made of what?
suger and phosphate groups
the rungs of the ladder are made of what?
(AT and CG) Nitrogen Bases
What
holds the two
strands of
DNA
together?
weak hydrogen links (AT have 2, CG have 3)
base pairing rules
A with T and C with G (AT Caleb Galbraith CG)
steps of DNA replication
1. unzip the DNA
2. new nucleotides go in
3. reform DNA bonds
what is a mutagen?
A factor that causes a change
in genetic material (DNA)
what are the 3 types of mutagens
positive= good affect
negative=bad affect
neutral=no affect
What is gene therapy?
An experimental procedure
where they try to replace a
mutated gene with a healthy
copy of the gene.