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Genetics 2
EXAM 2
48
Biology
Undergraduate 3
02/27/2011

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Term
Nucleotides
Definition
Molecules that when joined together make up the structural units of RNA and DNA. (DNA has 4 nucleotides: Adenine, Thymine, Guanine and Cytosine).
Term
Radioisotope
Definition
An unstable isotope of an element, an isotope being a version of an element with a distinct number of neutrons
Term
Essential Amino Acids
Definition
Amino Acids that can’t be synthesized but must be taken in with the diet.
Term
Primary Structure (Proteins)
Definition
The sequences of amino acids that make up the protein and determine the folding behavior of the protein
Term
Redundancy (Genetic Code)
Definition
More than one triplet of bases can code for the same amino acid
Term
Gene Family
Definition
Genes with a high degree of base sequence similarity that shows origin via gene duplication from a concestral gene
Term
Endosymbiosis
Definition
Arises where one organism lives inside another and each benefits from the relationship
Term
Transcription
Definition
Refers to the synthesis of a mRNA using one strand of the DNA in a gene as a template
Term
Archaea
Definition
A third domain of life that are similar to bacteria and often live in extreme environments
Term
Complementary Base Pairing
Definition
When the nucleotides match up proportionally (A to T and G to C).
Term
tRNA (Transfer RNA)
Definition
RNA that transfers a specific active amino acid to a growing polypeptide chain at the ribosomal site of protein synthesis during translation.
Term
DNA Replication
Definition
Biological process in which DNA is copied.
Term
DNA Transcription
Definition
The synthesis of a mRNA using one strand of the DNA in a gene as a template.
Term
mRNA (Messenger RNA)
Definition
Molecule of RNA encoding a chemical “blueprint” for a protein product
Term
Codons
Definition
Any Sequence of 3 nucleotides in order
Term
Triplets
Definition
The complementary 3 base sequence on DNA
Term
The Genetic Code
Definition
A set of rules in which information encoded in genetic material (DNA and mRNA sequences) is translated into proteins by living cells.
Term
Start and Stop Codons
Definition
Initiating and terminating translation
Term
Enzymes
Definition
Proteins that catalyze (increase or decrease) chemical reactions
Term
Antibodies
Definition
Protein that’s used by the immune system to detect and destroy bacteria and viruses.
Term
Point Mutations
Definition
Small changes in the DNA Sequence
Term
Frame Shift Mutations
Definition
Occur when one or more adjoining base pairs is inserted into the gene or delted from the gene (base pair “insertions” or “deletions”)
Term
Mutations
Definition
Changes in the DNA Sequence
Term
"Silent" Mutations
Definition
New triplet codes for the same amino acid as the old triplet because of “Redundancy” in the genetic code.
Term
Missense Mutations
Definition
A base pair change that results in a change in the amino acid that is coded for by the triplet.
Term
Nonsense Mutations
Definition
When a stop codon arises in the middle of mRNA that terminates translation prematurely.
Term
Ribosomes
Definition
A component that creates proteins from all amino acids and RNA representing the protein.
Term
Synonymous Mutations
Definition
Changes that do not alter the meaning of a triplet
Term
Non-Synonymous Mutations
Definition
Mutations that change the meaning of a triplet and cause one amino acid in the protein to be replaced
Term
Catalysts
Definition
A substance that initiates or accelerates a chemical reaction without itself being affected.
Term
Phylogeny
Definition
A sequence of events involved in the evolutionary development of a species or taxonomic group of organisms.
Term
Auto Catalysts
Definition
reaction that manufactures its own catalysts
Term
Bases
Definition
“backbone” of DNA that encodes information.
Term
Catabolism
Definition
Set of pathways that break down molecules into smaller units and release energy
Term
Anabolism
Definition
Set of metabolic pathways that construct molecules into smaller units.
Term
Amino Acids
Definition
A codon of 3 consecutive bases
Term
Non Essential Amino Acids
Definition
Amino acids that can be synthesized and do not require being taken in by the diet
Term
Hydrogen Bonding vs Covalent Bonding
Definition
Covalent bonds are stronger than hydrogen bonds and are able to bond to most elements on the periodic table. Hydrogen Bonds are only able to bond to oxygen, nitrogen or fluorine.
Term
Molecular Clock Hypothesis
Definition
the genetic distance or degree of difference in DNA or protein between any two species is roughly proportional to the length of time since they diverged from the concestor.
Term
Heredity
Definition
Genetic factors are passed on from one generation to the next
Term
Pre-Biotic Earth
Definition
contained a primaveal ocean and primordial atmosphere that consisted of methane, ammonia, water vapour and hydrogen.
Term
Pre-Biotic Soup
Definition
Origin of the pre-biotic soup was from the pre biotic earth and the nature of it consisted of organic compound consisting of no less than 7 amino acids
Term
Transcriptional Factor
Definition
Stimulates the transcription of genes
Term
Thermophiles
Definition
lovers of superheat (extreme heated temperatures)
Term
Domains of Life
Definition
Prokaryotes, Eukaryote and Bacteria
Term
Immortal Genes
Definition
Genes that are highly conserved
Term
Prokaryotes
Definition
Group of organisms that lack a nucleus
Term
Eukaryotes
Definition
Group of organisms that have a nucleus
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