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Chapter 9
Cells
25
Biology
10th Grade
02/19/2006

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Term
_______ Discovered harmful bacteria could turn virulent when mixed with bacteria that causes disease.
Definition
Griffith
Term
A substance prpared from killed or weakened microorganisms.
Definition
Vaccine
Term
______ Determined that harmless bacteria could turn _______when mixed with bacteria that causes disease
Definition
1. Griffith
2. virulent
Term
Transfer of genetic material from one organism to another
Definition
Transformation
Term
The experiments of ______ and ______
yielded results that suggested DNA was the genetic material.
Definition
1. Hershey
2. Chase
Term
_____________ were used to show that DNA, not protein. is the genetic material.
Definition
Bacteriopahages
Term
in the year _____ Franklin and wilkins photograph DNA.
Definition
1952
Term
Watson and Crick determined that DNA is in the shape of a ________ ______
Definition
Double Helix
Term
____________ are the subunits that make up DNA.
Definition
Nucleotides
Term
Nucleotides are made up of a ____________ _________, a ________ ______ and an _____ ______ ______
Definition
1. Phosphate Group
2.Nitrogen Base
3. Five carbon sugar
Term
The sugar in DNA
Definition
deoxyribose
Term
The 4 nitrogen bases in DNA.
Definition
1. Adenine
2. Guanine
3. Thymine
4. Cytosine
Term
The pairing of the nitrogen bases between two strands of DNA is known as the ____-_______ _____
Definition
Base-Pairing Rules
Term
_______ and _____ determined that a purine strand of DNA is always paired with a pyrimidine on the oppposite strand.
Definition
Watson and Crick
Term
_______ and ________ are purines.
Definition
Adenine and Guanine
Term
________ and ________ are pyrimidines.
Definition
Thymine and Cytosine
Term
The process of making of DNA is called _________
Definition
Replicatiion
Term
_________ Break hydrogen bonds between base pairs.
Definition
Helicases
Term
What is the purpose of DNA replication?
Definition
To make a new copy of the DNA strand
Term
This moves along the DNA strands adding mucleotides to the exposed nitrogen bases.
Definition
Polymerase
Term
Errors or changes in the nucleotide sequence.
Definition
Mutation
Term
How do errors occur in DNA?
Definition
They attach the wrong nitrogen base.
Term
The point where the DNA seperates.
Definition
Replication Fork
Term
Increases the speed of replication.
Definition
Multiple Replication Forks
Term
How long does it take for replication forks to repair an entire humman chromosome?
Definition
8 Hrs.
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