dna structure. what is dna: dna is a type of nucleic acid. nucleic acids are long chains of...
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DNA Structure
What is DNA:
•DNA is a type of Nucleic Acid.•Nucleic acids are long chains of
__________________.nucleotides
What is DNA:
•Labeled drawing of a ______________:nucleotide
What is DNA:
•DNA = ______________________•DNA is found in the ____________ of the
cell. Its function is to _____________________
____________________.
Deoxyribonucleic acidnucleus
store and transmitgenetic information
Structure of DNA:
•Scientists _________________ and ________________ are credited with discovering the structure of DNA in _______.
James WatsonFrancis Crick
1953
Structure of DNA:
•However: _________________ played a role in helping them discover DNA’s structure. She used ________________________ to take pictures of DNA. Then she collaborated with Watson and Crick. Unfortunately she died at age _____ before any recognition was given to her.
Rosalind Franklin
x-ray crystallography
37
Structure of DNA:
•DNA is a molecule made of ____ strands which wind around each other in the shape of a ______________. The nitrogen bases point toward the ___________ of the molecule. In other words a molecule of DNA looks like a _____________________ with steps made of ________________.
2
double helixcenter
twisted laddernitrogen bases
Structure of DNA:
•The four different nitrogen bases in DNA are: ____________(A), _____________(G), ____________(C), _____________(T).Adenine GuanineCytosine Thymine
Structure of DNA:
•____ always pairs with ____, and •____ always pairs with ____.•The bases that pair with each other are
called _____________________.
A TC G
complimentary bases
Structure of DNA:
•Nitrogen Bases can be separated into two different categories:
Categories Purines Pyrimidines
Examples:
Drawing:
GuanineAdenine
Thymine
Cytosine
Structure of DNA:
•A single DNA molecule may contain ____________ of nucleotides (AKA: bases)
•The order of the nucleotides (bases) in a DNA is a code that provides instructions for making ____________. A segment of DNA that codes for a specific protein is called a ______.
thousands
proteingene
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