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USMLE STEP 1


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Nickolas Prahl


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[Front]


1. DNA loops twice around histone octamer 2. Nucleosome is the histone octamer complex with DNA loops
[Back]


Characteristics of chromatin structure. What is a nucleosome

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32 questions
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Base + deoxyribose (Sugar)
Que es un NucleoSide?
Base + Deoxyribose + phosphaTe
Que es un NucleoTide?
PURE As Gold --> Adenina y Guanina
Cuáles son las PURINAS?
CUT the PY --> Citosina, uracilo, timina
Cuáles son las PIRIMIDINAS?
Adenina con timina (2 H bonds) y Guanina con citocina (3 H bonds) Crazy Glue
Cómo son las uniones entre las bases nitrogenadas?
1. deaminación 2. deaminación 3. metilación
1. Cómo se sintetiza guanina de adenosina? 2. Cómo se sintetiza uracilo de citocina? 3. Cómo se sintetiza timina de uracilo?
Methionine and tryptophan
Aminoácidos que solo se codifican poor un codon?
Glycine, Aspartate, Glutamine--> GAG
Amino acids necessary for purine synthesis:
Elongates leading strand
DNA polymerase III