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Test 1 Details
Medical School Biochem
77
Biochemistry
Graduate
08/31/2011

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Cards

Term
Which nucleotides are Purines?
Definition
A and G
Term
Which nucleotides are Pyrimidines?
Definition
T and C
Term
Euchromatin exhibit a high histone modification of what kind?
Definition
Acylation
Term
Heterochromatin exhibit a high histone modification of what kind?
Definition
Methylation
Term
What is the structure of the main histone complex?
Definition
Octomer
(H2A,H2B,H3,H4)2
Term
What enzyme catalyzes Acylation of Histones?
Definition
HAT
Histone Acyltransferase
Term
What enzyme catalyzes Histone Deacylation?
Definition
HDAC
Histone DeAcetylTransferase
Term
What enzyme catalyzes Histone Methylation?
Definition
HMET (HMT [source: wikipedia])
Histone Methylase
Term
What enzyme catalyzes Histone Demethylation?
Definition
HDemethylase
Term
What disease is characterized by rapid aging in children?
Definition
Laminopathies:

Laminum is the proteins of the nucleus, laminopathies refer to pathologies associated with the laminum
Term
What arranges DNA into loops so that it can be transcribed?
Definition
Insulator DNA and Proteins
Term
What is the action of Adriamycin? What is it used to treat?
Definition
Adriamycin blocks DNA replication. Used as a supplemental drug to treat Leukemia
Term
What is the name of the factor that denatures DNA prior to replication?
Definition
DnaA
Term
What enzyme helps with Gene Expression and DNA replication?
Definition
Human Topoisomerase II
Term
What is the action of Ciprofloxacin (cipro)? What is it used to treat?
Definition
Ciprofloxacin targets DNA Gyrase (Prokaryotic topoisomerase II). It is used to treat bacterial infections
Term
What is the action of Etoposide (Toposar)? What is it used to treat?
Definition
Action on human topoisomerase II. Used to treat testicular cancer
Term
What is the action of Doxorubicin (Adriamycin)?
Definition
Action is on Human topoisomerase II. Treats a variety of cancer
Term
What feature on the RNA primer allows DNA Polymerase III to land on it and begin synthesis?
Definition
3' OH
Term
What is the function of Polymerase Alpha? Does it proofread?
Definition
Functional analog to Primase. NO
Term
What is the function of Polymerase Beta? Does it proofread?
Definition
DNA Repair. NO
Term
What is the function of Polymerase Gamma? Does it Proofread?
Definition
Synthesis of mitochondrial DNA. YES
Term
What is the function of Polymerase Delta? Does it proofread?
Definition
Analog to Polymerase I. YES
Term
What is the function of Polymerase Epsilon? Does it proofread?
Definition
Analog to Polymerase III. YES
Term
What type of analogs inhibit DNA polymerases?
Definition
Nucleoside Analogs
Term
What is the action of Acyclovir? What is it used to treat?
Definition
Acyclovir is a nucleoside analog missing the 3'OH (read: primer). Causes chain cancellation.

Used to treat viruses, predominantly Herpes Simplex Virus
Term
What is the general name of the proteins that helps restore histone structure after replication?
Definition
Histone Chaperones
Term
What is the name of the proteins that maintain epigenetic code (histone modification patterns) after replication?
Definition
Reader-Writer Complexes
Term
What is the name of the enzyme that corrects for telomere shortening?
Definition
Telomerase Reverse Transcriptase
Term
What is the name of the enzyme that catalyzes DNA-Only Transposons? How does it recognize the sequence?
Definition
Active-Transposase Complex. Recognizes inverted short repeat sequences on either end of DNA sequence
Term
What is a common mechanism for the proliferation of drug resistance in bacteria?
Definition
DNA only transposons
Term
What is the enzyme that works with human endogenous retroviruses to introduce the cDNA into the genetic code?
Definition
Integrase
Term
What is the name of the human endogenous retrovirus that has diagnostic and prognostic value for a disease. What is the name of the disease?
Definition
HERV-K and Malignant Melanoma
Term
What is the name of the human endogenous retrovirus that has diagnostic and prognostic value for a disease. What is the name of the disease?
Definition
HERV-K and Malignant Melanoma
Term
What diseases are related with L1 (line) elements?
Definition
Hemophilia A and B, Beta Thalassemmia, Duchenne's, and some Colon Cancers
Term
What diseases are related with SINE elements?
Definition
Some colon and breast cancers, acute intermittent porphyria, and hemophilia A
Term
What are the proteins for Prokaryotic Strand-Directed Mismatch Repair?
Definition
MutS and MutL
Term
What disease is linked with strand-directed mismatch repair?
Definition
HNCC (Lynch Syndrome): Hereditary nonpolyposis colorectal cancer
Term
What are the genes that code for the MutS and MutL analogs in humans?
Definition
MLH1 and MSH2
Term
What are the three chemical mechanisms most likely to cause spontaneous alterations on the DNA code?
Definition
Hydrolysis
Methylation
Oxidation
Term
What is the most common spontaneous alteration on the DNA genome? What is the result and what enzyme corrects it?
Definition
Methylation of position 8 on Guanine.

Forms an 8-oxo-guanine

Repaired by OGG1
Term
What does depurination cause?
Definition
Loss of a purine. If uncorrected will result in a point mutation (deletion)
Term
What does deamination do?
Definition
C->U. Results in a substitution mutation
Term
In base excision repair, what enzyme cleaves the phosphodiester bond after the glycosylase has removed the base?
Definition
AP Nuclease
Term
BRCAII is associated with what sort of DNA repair?
Definition
Homologous End-joining via homologous recombination
Term
What is the disease associated with a breakdown in nucleotide excision repair?
Definition
Xeroderma Pigmentosum
Term
ON what RNA Eukaryotic subunit does Rifampin bind?
Definition
Beta Subunit
Term
What disease is associated with upregulation of sigma factor?
Definition
Pseudomonas, mucoid phenotype in CF patients

Upregulation of RPoh
Term
What is the effect of alpha-amanatin (Death Cap Mushrooms) on RNA synthesis?
Definition
Strong inhibition of Pol II, weak inhibition of Pol III
Term
What are the two processes that aid rRNA in gaining its secondary structure?
Definition
Pseudo-uradine
2' O methylation
Term
What is the TATA box code?
Definition
TATAA/TAA/T
Term
What causes the transcription machinery to fall apart during mRNA synthesis?
Definition
TFIIH
-Phosphorylates C terminal domain
Term
What is the name of the molecule that causes the 5' to 5' capping bond?
Definition
7mG

7-Methyl-Guanosine
Term
Necessary codes for mRNA splicing?
Definition
5' GU
3' AG

An Adenine in the middle
Term
Code for the PolyA to attach to?
Definition
AAUAAA
Term
What are the two proteins of termination?
Definition
CPSF and CstF
Term
3 functional domains of transcription factors?
Definition
DNA binding Domain
Dimerization Domain
Activation Domain
Term
What is the famous inhibitory protein in zinc-finger proteins?
Definition
HSP 90
Term
What is the Helix-loop-helix protein that regulates muscle development?
Definition
MyoD
Term
Start Codon
Definition
AUG
Term
Stop Codons?
Definition
UAA, UAG, UGA
Term
What is a transition point mutation?
Definition
Purine for Purine or Pyrimidine for Pyrimidine
Term
What is a Transversion point mutation?
Definition
Purine to Pyrimidine or vice vers
Term
Amino acid attachment to tRNA?
Definition
3' end -CCA
Term
What are the names of the cap-binding proteins?
Definition
EIF4G and EIF4E
Term
What hemoglobin genes are expressed in the first trimester?
Definition
Alpha and Epsilon
Term
What Hemeglobin genes are expressed in the second trimester?
Definition
Alpha and Gamma
Term
What Hemoglobin genes are expressed from 6 months on?
Definition
Alpha and Beta
Term
How does Rapamycin help decrease the odds of having to have a post-stent revascularization?
Definition
Inhibit the mTOR pathway

mTOR is a signalling pathway involved in translation
Term
What are two type II restriction enzymes that make staggered cuts?
Definition
EcoRI and Hhal
Term
What is the name of a Type II restriction enzyme that makes blunt ends?
Definition
Smal
Term
What is the special nucleotide used in the Sanger method to decode DNA?
Definition
Dideoxynucleotides
ddXTP
Term
What is special about the polymerase used in PCR?
Definition
High temperature optimum, will not denature but in fact thrive in hot conditions
Term
What are the three basic applications of PCR?
Definition
1. Identity-related
2. Diagnostic
3. For cloning
Term
What is the action of Aminoglycosides (such as Streptomycin)?
Definition
Bind to 30S subunit, cause misreading of code.

At high levels blocks initiation
Term
What is the action of tetracyclines?
Definition
Binds to 30S and blocks A spot
Term
What is the action of Chloramphenicol?
Definition
Binds to 50S and blocks peptide bond formation.

High dosages can damage Mitochondrial translation
Term
What is the action of Erythromycin?
Definition
Binds 50S and block peptidyl transferase
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