DNA Structure
What is DNA:
• DNA is a type of Nucleic Acid.
• Nucleic acids are long chains of
nucleotides
__________________.
What is DNA:
nucleotide
• Labeled drawing of a ______________:
What is DNA:
Deoxyribonucleic acid
• DNA = ______________________
• DNA is found in the ____________
of the cell.
nucleus
store and transmit
Its function is to _____________________
genetic information
____________________.
Structure of DNA:
James Watson and
• Scientists _________________
Francis Crick
________________
are credited with
1953
discovering the structure of DNA in _______.
Structure of DNA:
Franklin played a role
• However: Rosalind
_________________
in helping them discover DNA’s structure. She
used ________________________
to take
x-ray crystallography
pictures of DNA. Then she collaborated with
Watson and Crick. Unfortunately she died at
age37
_____ before any recognition was given to
her.
Structure of DNA:
2 strands which
• DNA is a molecule made of ____
wind around each other in the shape of a
______________.
The nitrogen bases point
double helix
toward the ___________
of the molecule. In
center
other words a molecule of DNA looks like a
_____________________
with steps made
twisted ladder
of ________________.
nitrogen bases
Structure of DNA:
• The four different nitrogen bases in DNA are:
Adenine
Guanine
____________(A),
_____________(G),
Cytosine
Thymine
____________(C),
_____________(T).
Structure of DNA:
T
• ____
and
A always pairs with ____,
C always pairs with ____.
G
• ____
• The bases that pair with each other are called
complimentary bases
_____________________.
Structure of DNA:
• A single DNA molecule may contain
thousands of nucleotides (AKA: bases)
____________
• The order of the nucleotides (bases) in a DNA is
a code that provides instructions for making
protein
____________.
A segment of DNA that codes
gene
for a specific protein is called a ______.
Structure of DNA:
• What is a gene: ______________________
A segment of DNA that
codes
for a specific protein
_________________________.
• What do proteins do?
Make up all your traits – hair type and color
(keratin), what color your skin is (melanin),
what enzymes you have to break down food
(lactase, peroxidase, amylase), how strong you
are (actin/myosin)
Structure of DNA:
• Label the following:
▫ Base Pairs – Adenine, Guanine, Cytosine,
Thymine
▫ 1 Nucleotide
▫ Backbone made of sugar