Structure and replicatuon of DND Flashcards
1
Q
Name the repeating units that make up a molecule of DNA
A
Nucleotides
2
Q
Shape of DNA is described as
A
double helix
3
Q
Base pairing rules for DNA
A
Adenine (A) - Thymine (T)
Guanine (G) - Cytosine (C)
4
Q
Why are strands of DNA described as antiparallel
A
they run in opposite directions
5-3
3-5
5
Q
5 Substances required for DNA replication
A
- Primers
- Nucleotides
- DNA polymerase
- Ligase
- ATP
6
Q
Why does the lagging strand need to be copied in fragments
A
DNA polymerase can only add DNA nucleotides in one direction (5-3)
7
Q
What end does DNA polymerase add new nucleotides
A
3’
8
Q
The small section of DNA need by DNA polymerase to start replication
A
primer
9
Q
What does DNA Polymerase do
A
it joins fragments of DNA together on the lagging strand
10
Q
What does ligase do
A
Bonds nucleotides into the backbone of a new DNA strand
