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Level Two Definitions
DNA
39
Biology
9th Grade
02/01/2013

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Term
DNA
Definition
The "blueprints" of your body. They are made up of deoxyribonucleic acids and they are present in all living organisms as well as are the foundation of chromosomes.
Term
Double Helix
Definition
A pair of DNA strands that are interwoven in the structure of a DNA strand.
Term
Chromosome
Definition
A strand of DNA found in the nucleus of all living cells. A chromosome carries genetic information in the form of a DNA.
Term
Genome
Definition
A genome is the set of chromosomes that make up your genetics and traits.
Term
Protein
Definition
Large molecules made up of amino acids.
Term
Heredity
Definition
The passing of traits down through a family/relatives.
Term
Gene
Definition
A certain chromosome that is passed through heredity that possesses a single trait.
Term
Monomer
Definition
A molecule that can be bonded to other identical molecules to form a polymer.
Term
Nucleus
Definition
The center of the cell inside the nucleolus that contains the chromosomes.
Term
Trait
Definition
A certain quality or feature of an organism described by its genetic makeup.
Term
Polymer
Definition
A relatively large substance that is make up of molecules of the same substance.
Term
Genetic Code
Definition
the three acids that make up a singe protein inside a DNA strand. Ex. AUG (starting codon) and UAG (ending codon)
Term
Nucleotide
Definition
The result of combining a deoxyribose sugar, a phosphate, and a base. These form the double helix of DNA.
Term
Hydrogen Bonds
Definition
The bonds that connect the two bases on opposite sides of the Double Helix.
Term
Base
Definition
The acids that form the base of the double helix. When in a double helix, the join with their complementary acid.
Term
Phosphate
Definition
The "connecting" molecule in a DNA double helix. It helps form the "ladder". Made of a phosphate acid.
Term
Deoxyribose Sugar
Definition
The part of a nucleotide that forms the ladder and joins with the base.
Term
Mutation
Definition
Any change in the sequence of DNA
Term
Mutagens
Definition
Environmental factors that cause mutations.
Term
Somatic Mutations
Definition
Mutations that occur within one person's life and only affect that person.
Term
Gametic Mutations
Definition
Mutations that are only passed through heredity, they do not show up in the individual, only the next generation
Term
Positive Mutations
Definition
Mutations that help an organism survive
Term
Negative Mutations
Definition
Mutations that cause death, disease, or in some way reduce an organism's chance of survival
Term
Somatic Cell
Definition
Cells that make up most of the bode and have two sets of chromosomes
Term
Diploid
Definition
A cell that has two sets of chromosomes
Term
Gametes
Definition
Sex cells
Term
Haploid
Definition
A cell that contains only one set of chromosomes
Term
Zygote
Definition
The first somatic cell of an organism, formed when the sperm and egg unite
Term
Unit of Inheritance
Definition
Another name for DNA
Term
Deoxyribonucleic Acid
Definition
The acid that DNA stands for
Term
Hydrogen Bonds
Definition
The bonds that connect the two bases of the two DNA strands together in a Double Helix
Term
DNA replication
Definition
The process in which DNA is
replicated to produce an exact
copy of itself.
Term
Complementary Strand
Definition
The strand of DNA that goes with the one it bonds with
Term
Unwinding
Definition
The first act of DNA replication, the DNA is unwound by enzymes to allow
replication to occur
Term
Elongation
Definition
More nucleotides attatch themselves to the eisting DNA strand and a new DNA strand is made using the
original as a template
Term
Termination
Definition
When DNA synthesis is completed, and the new DNA molecule forms back into a double helix shape
Term
Enzyme
Definition
A "chemical helper" that assists in almost all functions of DNA replication and more
Term
Parent DNA Strands
Definition
Unwound DNA strands used as a template for a new daughter strand
Term
Base pairing rule
Definition
The rule that states that Adenine always pairs with Thymine and Cytosine always pairs with Guanine
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