History of DNA
How did Rosalind Franklin take a picture of DNA?
X ray
Nucleotide
First step in replication
DNA unzips
Enzymes are what type of macromolecule
Protein
When tissues work together, what do they make?
Organs
Who was the first scientist to photograph DNA?
Sugar (deoxyribose), phosphate, nitrogenous base
What is Chargaff's rule?
A=T, C=G
This enzyme unzips DNA
DNA Helicase
What are the levels of organization of living things from smallest to largest?
Cells > Tissues > Organs > Organ Systems > Organisms
Who was given credit for the discovery of DNA?
Watson and Crick
In replication, a purine will always pair with a _____
pyrimidine
How are the nitrogenous bases bonded to each other in a DNA molecule?
By hydrogen bonds
This enzyme joins individual nucleotides to create a new DNA strand
DNA polymerase
What was the purpose of the ethanol and the dish soap in the strawberry experiment?
Dish soap - It breaks open the nuclear and cell membranes
Ethanol - Causes the DNA to clump together and precipitate
Why is DNA important?
What is the backbone of DNA?
Sugar and phosphate (covalently bonded)
Where does replication occur in eukaryotic organisms?
Nucleus
What two enzymes are used in DNA replication?
Helicase and DNA polymerase
Why is DNA replication important?
So all cells receive the same DNA when cells replicate