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DNA
DNA Structure, Replication, and Gene Expression
48
Biology
9th Grade
10/10/2013

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Term
DNA
Definition
Deoxyribonucleic Acid
Term
RNA
Definition
Ribonucleic Acid
Term
Nucleotide
Definition

Monomer

Contains a phosphate group, base, and sugar

Term
Bases of DNA
Definition

Thymine

Adenine

Guanine

Cytosine

Term
Base Pairs of DNA
Definition

Thymine - Adenine

Guanine - Cytosine

Term
Bases of RNA
Definition

Uracil

Adenine

Guanine

Cytosine

Term
Base Pairs of RNA
Definition

Uracil - Adenine

Guanine - Cytosine

Term
Watson & Crick
Definition
Credited with the discovery of the structure of DNA.
Term
Rosalind Franklin
Definition
Produced an x-ray of the DNA molecule.
Term
Chargaff
Definition
Scientist who's data stated there are the same number of thymine and adenine as well as the same amount of Guanine and Cytosine.
Term
Deoxyribose
Definition
Sugar found in DNA
Term
Ribose
Definition
Sugar found in RNA
Term
Double-Helix
Definition
Shape of DNA
Term
Anti-parallel
Definition
The sides of DNA are arranged in opposite directions.
Term
Single-Strand
Definition
Shape of RNA
Term
Purines
Definition
Guanine & Adenine
Term
Pyrimidines
Definition
Thymine & Adenine
Term
Helicase
Definition
Splits DNA between the bases
Term
DNA Polymerase
Definition
Assembles new nucleotides during DNA Replication.
Term
5' - 3'
Definition
Direction of DNA Replication
Term
Leading Strand
Definition
Assembles new nucleotide toward the replication fork
Term
Replication Fork
Definition
Produced from DNA splitting.
Term
[image]
Definition
Nucleotide
Term
[image]
Definition
Double Helix shape
Term
[image]
Definition
Purines
Term
RNA Primer
Definition
Used as a starting point on the Lagging Strand during DNA Replication
Term
Okazaki Fragment
Definition
A section of replicating DNA on the Lagging strand, between the primers.
Term
[image]
Definition
Pyrimidines
Term
Lagging Strand
Definition
Occurs in small segments as the DNA duplex unwinds because unzipping occurs in the 5'-3' direction.
Term
DNA Polymerase III
Definition
Attaches new DNA nucleotides to the lagging and leading strand during DNA replication.
Term
DNA Ploymerase I
Definition
Removes RNA primer and replaces with DNA nucleotides
Term
Primase
Definition
Places the RNA primer on the lagging strand.
Term
Ligase
Definition
Connects the okazaki fragments
Term
Chromosome
Definition
DNA supercoiled around histone proteins. Used to package DNA for cell division.
Term
Nucleosome
Definition
8 histone proteins with DNA wrapped twice.  The 9th histone ties the DNA.
Term
Karyotype
Definition
The arrangement of chromosomes based on size, banding pattern, and location of the centromere
Term
Down Syndrome
Definition
Trisomy 21
Term
Klinefelter Syndrome
Definition
XXY
Term
Turner Syndrome
Definition
X
Term
Nondisjunction
Definition
Produces several chromosomal disorders by unequal separation of chromosomes during meiosis.
Term
Sister Chromatids
Definition
Identical halves of a chromosome attached by the centromere.
Term
Transcription
Definition
Transcription is the first step of gene expression, in which a particular segment of DNA is copied into RNA by the enzymeRNA polymerase.
Term
Translation
Definition
The process in which cellular ribosomes create proteins.
Term
mRNA
Definition
messenger RNA
Term
tRNA
Definition
transfer RNA
Term
codon
Definition

3 RNA nucleotides  from mRNA

used to read the mRNA three nucleotides at a time

Term
anticodon
Definition

on tRNA

matches up with the codon of the mRNA.

Term
RNA Polymerase
Definition
assemble RNA nuclotides
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