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Biochem Test 1
DNA/RNA/Protein
33
Biochemistry
Undergraduate 3
10/07/2013

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Term
Two types of Nucleic Acids
Definition
Purine and Pyrimidine
Term
Purine
Definition
Adenine and Guanine (smaller)
Term
Pyrimidine
Definition
Thymine, cytosine, and uracil
Term
Nuclease
Definition
Class of enzyme that cleaves DNA and RNA
gets rid of old DNA
Term
Endonuclease
Definition
A nuclease that cleaves DNA/RNA in the middle of a strand
Term
Exonuclease
Definition
Nuclease that cleaves DNA/RNA at the end of a strand
Term
Phosphodiester Bond
Definition
Bond between Nucleic Acid bases
Term
Difference between eukaryotic/prokaryotic replication
Definition
prokaryotic couples trasncription, translation, and modification while eukaryotic separates each section
eukaryotic can modify mRNA inside nucleus
Term
DNA Array
Definition
tray with wells containing DNA oligonucleotide single strands, 5' bonded to chip
each strand corresponds to a gene
cell mRNA is isolated and introduced to array (dye in 5' end)
gene bonds to corresponding DNA fragment and becomes fluorescent
Term
Type of NonCanonical DNA
Definition
Bend
Triple Strand
Quadruple Strand
Cruciform
Term
DNA Polymerase
Definition
protein that creates RNA
Term
Viral attack
Definition
Viran RNA is injected
hijacks ribosomes using IRES and viral RNA Replicase
kills cell
Term
Protein Polymer
Definition
unhealthy conformation of proteins
Term
DNA Structure
Definition
composed of sugar molecule (ribose or deoxyribose), nucleic acid base, and phosphodiester bonds
Term
Nucleoside
Definition
Base and a sugar alone
Term
Nucleotide
Definition
Base, sugar, and phosphate
Term
Dual Strand
Definition
bases are hydrophobic and lend to helix
sugars are hydrophobic, end up outside
phosphate is hydrophilic and ends up outside
Term
annealing
Definition
cooling of DNA fragments to allow reformation
Term
Bent DNA
Definition
produced by 4-6 A phased with 10 base pair spaces
DNA binding proteins can help bends as well
the 2 bonds of Adenine (pyrimidine) allows for flexibility of bend
Term
Cisplatin
Definition
anti-cancer drug bonds tetravalent platinum to form a kink in DNA
enough kinks and you get apoptosis
Term
DNA organization in the cell
Definition
double helix
helix wraps around protein beads
beads on a string wrap around into a larger helix
large helix hugs protein scaffold and twists into bundles
bundles bunch together and form chromosome
Term
histone
Definition
protein that helps organize DNA in Eukaryotic Cells (beads for bends)
Term
cruciform
Definition
requires inverted repeats in opposite strand
when heated and cooled, copied section bonds across strands
found at promoter for replication and transcription
stabilized by proteins
Term
Triple strand DNA
Definition
uses hoogsteen bonds between nitrogen and hydrogen (Hbond basically)
TAT, CGC, GAG, etc.
occurs during recombination/transcription
RecA protein wraps single strand around duplex of DNA
Term
quadruple strand DNA
Definition
only exists with a quartet of G's
stabilized by a metal ion inside the helix
found in telomeres, maintained by enzymes
Term
Supercoiled DNA
Definition
DNA in a ring that has been twisted
can be L or R hand (+ or -)
WC bond formed across itself
DNA enzyme twists strand ahead of itself
Term
topoisomerases
Definition
enzyme that relaxes supercoiled DNA
1. breaks strand one at a time
2. breaks bond and holds both ends and lets one side relax then reattaches.
Term
Types of RNA
Definition
mRNA
tRNA
rRNA
small stable RNA
Term
mRNA
Definition
carries info to ribosomes
prokaryotic mRNA has no CAP but sometimes polyA Tail
eukaaryotic mRNA has structure at 5' end forming hairpin
Term
IRES
Definition
structure on mRNA that works with CAP to increase efficiency of translation
Term
tRNA
Definition
less than 100 bases clover leaf or double L fold
anticodon loop helps bring amino acid to ribosome
3' end carries Amino acid
Term
Ribosomal RNA
Definition
80% of cellular RNA and stable
determined by non translated 5' end
skeleton of Ribosome
Term
small stable RNA
Definition
RNA processing and trasport
controls translation and functions in protein recognition
as amount of protein grows or nutrient falls, small stable inhibits translation by hybridizing with mRNA
transcription can be regulated by small stable competing with RNA polymerase at promoter (low nutrient)
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