DNA Structure Flashcards
1
Q
How is DNA arranged?
A
It is tightly coiled and packaged with associated proteins
2
Q
What does DNA carry?
A
The genetic code for inheritance.
3
Q
What is the shape of DNA?
A
A double Helix
4
Q
How are two DNA strands held together?
A
Hydrogen Bonds
5
Q
The strands run in opposite directions. What is the term used to describe this arrangement?
A
Antiparallel
6
Q
What end is the hydroxyl
A
3’
7
Q
What end is the phosphate group
A
5’
8
Q
What is a nucleotide composed of
A
Deoxyribose, phosphate and a base
9
Q
What are the four bases found in DNA
A
Adenine, Thymine,Cytosine, Guanine
10
Q
Name the base pairs.
A
Adenine and Thymine
Guanine and Cytosine
11
Q
Describe the process of replication.
A
- DNA is unwound and unzipped to form two template strands
- DNA polymerase needs a primer to start replication and can only add complementary DNA nucleotides to the deoxyribose (3’) end of the DNA strand
- This results in one strand being replicated continuously and the other strand replicated in fragments which are joined by ligase.
