The Genetic Code
Which scientist's X-ray diffraction photo helped reveal the structure of DNA?
Franklin
What are the three parts of a nucleotide?
WHAT
What is DNA Replication?
Creating two identical DNA molecules from one original DNA molecule
This is the first step in DNA replication.
Unwind and unzip
Who created the first 3D helical model of DNA showing the "double helix"?
Watson and Crick
A bond is between sugars and phosphates, while a bond is between nitrogenous bases.
Covalent; Hydrogen
WHERE
Where does DNA replication take place?
Nucleus
This is the second step in DNA replication
New bases (nucleotide) are added
The complementary base pairing rule is:
A = T
G = C
Who described this rule?
Chargaff
What is the complementary sequence to this DNA strand:
ATTGCTAGC
TAACGATCG
WHEN
When does DNA replication take place?
S Phase of Interphase
This is the third step in DNA replication
The bonds are sealed ("glued") together.
How is the DNA of all living things similar?
All use the same four bases (A,T,C,G)
The new DNA molecules are "semi-conservative". What does this mean?
They have one old strand and one new strand.
WHEN
Is DNA replication before or after cell division?
Before
What does the enzyme helicase do?
Unzip and unwind the DNA
Amino acids build proteins in all living things. Is the DNA code for an amino acid different between a frog and a fly?
No
What are the four nitrogen bases contained in DNA?
1. Thymine
2. Adenine
3. Cytosine
4. Guanine
WHY
Why is DNA replication important?
To pass on a complete set of DNA during cell division
What does the enzyme polymerase do?
adds bases (nucleotides) to the new strand