MK Shared "1.2 FA Biochemistry" - 106 Picmonics

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1.2 FA Biochemistry

Nucleus
Characteristics
Transcription Factors
Nucleolus Transcribes rRNA
DNA
RNA
Nuclear Membrane is a Bilayer
Membrane is Continuous with Endoplasmic Reticulum
Nucleus Surrounded by Cytosol
Nuclear Pores
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2 mins
Chromosome Forms
Characteristics
Chromatid
Sister Chromatids
Homologous Chromosomes
Tetrad
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2 mins
Chromosome Components
Characteristics
DNA
Histones
Nucleosomes
Chromatin
Chromosome
Telomere
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1 min
DNA Base Pairing
Characteristics
3' End
5' End
Antiparallel Base Pairing
Complementary Strands Pair
Thymine And Adenine Pair
2 Hydrogen Bonds
Adenine and Uracil Pair in RNA
Guanine And Cytosine Pair
3 Hydrogen Bonds
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3 mins
Orotic Aciduria
Pathophysiology
Autosomal Recessive
Defect in UMP Synthase
De Novo Pyrimidine Synthesis Pathway
Symptoms
Increased Orotic Acid in Urine
Megaloblastic Anemia
No Response to B12 or Folate
Non-Hyperammonemic
Failure to Thrive
Treatment
Oral Uridine Monophosphate
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2 mins
Methotrexate
Indications
Rheumatoid Arthritis
Cancer
Medical Abortion
Mechanism
Folic Acid Analog
Inhibits Dihydrofolate Reductase
Side Effects
Pulmonary Fibrosis
Myelosuppression is Treated with Leucovorin Rescue (Folinic Acid)
Macrocytic Anemia
Hepatitis
Teratogenic
Mucositis
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1 min
Trimethoprim
Mechanism of Action
Bacteriostatic
Inhibits Bacterial Dihydrofolate Reductase
Causes Sequential Block of Folate Synthesis
Used in Combination with Sulfamethoxazole
Combination Used For Recurrent Urinary Tract Infections
Indications
Shigella
Salmonella
Pneumocystis Jiroveci Pneumonia
Side Effects
Decrease in Red and White Blood Cells
Alleviated with Leucovorin Rescue
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2 mins
Ribavirin
Mechanism
Hypermutation in RNA Viruses
Inhibits Inosine Monophosphate Dehydrogenase
Indications
Hepatitis C
Viral Hemorrhagic Fevers
Respiratory Syncytial Virus (RSV)
Side Effects
Hemolytic Anemia
Teratogen
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1 min
Gout Treatment
Acute (Acute-angle)
NSAIDs
Glucocorticoids
Colchicine
Impairs Leukocyte Chemotaxis
Chronic Gout (Crone Goat)
Inhibit Xanthine Oxidase
Allopurinol
Febuxostat
Inhibit Reabsorption of Uric Acid
Probenecid
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1 min
Adenosine Deaminase Deficiency
Adenosine to Inosine
Excess ATP
Inhibition of Ribonucleotide Reductase
Prevents DNA Synthesis
Decreases B Cells and T Cells
Major cause of SCID
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1 min
Lesch-Nyhan Syndrome
X-linked Recessive
Absence of HGPRT
Hypoxanthine to IMP
Guanine to GMP
Excess uric acid
Gout
Retardation
Self-mutilation
Choreoathetosis
PRPP is increased
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2 mins
DNA Replication
Characteristics
DNA Gyrase Uncoils Supercoil
Helicase Separated DNA Strand
Single-Strand Binding (SSB) Protein Keeps Strands Separated
DNA Polymerase Synthesizes New Strand
3' To 5' Reading
Primase Creates RNA Primer
Telomerase Caps DNA Ends
DNA Ligase Combines Okazaki Fragments
Okazaki Fragments On Lagging Strand
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4 mins
Transcription Overview
Initiation
RNA Polymerase binds Promoter
Elongation
DNA Opens by Helicase
RNA Polymerase reads 3' to 5'
Nucleotides added to 3' end
Termination
Stem Loop Formation
Rho protein factor
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3 mins
RNA
Characteristics
mRNA
3' Poly A Tail
5' Cap
Template For Translation
rRNA
Catalyzes Amino Acid Bonds
Component of Ribosome Enzyme
tRNA
Anticodon Region
3' Tail Bind To Amino Acid
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2 mins
Eukaryotic Post Transcriptional Modification
Modifications in Nucleus
mRNA Splicing
Introns Cut Out
Exons spliced together
Alternate Splicing
5' Cap added
3' Poly A tail added
Transported to Cytosol
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2 mins
Translation: Initiation
Translation: Initiation
Ribosome Binds mRNA
Complex Reads 5' to 3'
AUG Start Codon
Initiation Complex Forms
GTP and Initiation Factor Bring Complex Together
Met-tRNA Binds P Site
tRNA With Bound Amino Acids Binds A Site
Amino Acid Chain Created in Elongation
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3 mins
Translation: Elongation & Termination
Translation: Elongation
Amino Acid Chain Created
New Amino Acid-tRNA Enters A Site
GTP and Elongation Factors Help tRNA Enter A Site
Peptide Chain Binds to New Amino Acid
Peptide Chain-tRNA Moves to P Site
Free tRNA in P Site Moves to E Site
Translation: Termination
Stop Codon at A Site Causes Termination
Release Factors Help Complex Disassociate
Complex Falls Apart
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3 mins
Prophase
Nuclear Membrane Disintegrates
Centrioles Migrate
Spindle Apparatus Forms
Meiosis I starts Diploid
Homologous Chromosomes form Tetrads
Tetrads Cross Over
Meiosis II starts Haploid
Mitosis starts Diploid
Sister Chromatid Pairs Stay Separated
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2 mins
Metaphase
Characteristics
Microtubules Extend from Centrioles' Spindles
Centromere
Kinetochore
Meiosis I Tetrads Aligned at Metaphase Plate
Meiosis II Sister Chromatids Aligned at Metaphase Plate
Mitosis Sister Chromatids Aligned at Metaphase Plate
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57 secs
Anaphase
Spindle Microtubules from Centrioles Split Pairs
Meiosis I Tetrad Splits into Two Sister Chromatid Pairs
Meiosis II Sister Chromatid Pair Splits into Two Chromatids
Mitosis Sister Chromatid Pair Splits into Two Chromatids
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1 min

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