Pyrimidine Study guides, Class notes & Summaries

TEST BANK FOR GENETICS AND GENOMICS IN NURSING AND HEALTH CARE 1ST EDITION 1. In which body or cell area are most genes in humans located? A. Nucleus B. Mitochondrion C. Cytoplasm D. Plasma membrane 2. Which condition or statement exemplifies the concept of genomics rather than genetics? A. The gene for insulin is located on chromosome 11 in all people. B. Expression of any single gene is dependent on inheriting two alleles. C. Sex-linked recessive disorders affect males more o...

Pyrimidine - One carbon ring Cytosine, Thymine, Uracil Purine - Two carbon rings Adenine, Guanine How are nucleotides joined together? - Condensation to form phosphodiester bond What is the function of mRNA? - Carries genetic info out of nucleus Transcript translated to protein What is the function of tRNA? - Carries aa to ribosome Anticodon pairs with codon on mRNA strand What is the function of rRNA? - part of ribosome structure most abundant RNA coordinated coupling of tRNA to mRNA...

USLME Biochem - First Aid Exam Questions With Accurate Answers. Chromatin structure - answerDNA exists in condensed chromatin form in order to fit in nucleus Negatively charged DNA loops twice around positively charged histone octamer (2 sets of H2A, H2B, H3 and H4) to form nucleosome "bead" Octomer subunits consist primarily of lysine and arginine amino acids (positively charged). H1 ties nucleosome beads together in a string Heterochromatin - answerCondensed, transciptionally inactiv...

PATHO Test 2 - UTMB EXAM WITH COMPLETE SOLUTIONS Primary Function of Respiratory system - gas exchange with oxygen from the air being tranferred to the blood and carbon dioxide genome all of the genetic info in an organisms DNA Chromosomes Where the basic genetic info is stored. 23 pairs or 46 chromosomes. Female = XX Male = XY DNA Molecule - double stranded helix - stored within nucleus - stores genetic information Nitrogenous bases Pyrimidine bases - Thymine -...

Why do helicase and gyrase need to work together? correct answers Helicase unwinds DNA and gyrase relieves the torsional strain. Match the name of the DNA repair mechanism with the correct description. Functions with DNA replication to remove incorrect nucleotides from the nascent strand. Requires an endonuclease to remove an abasic nucleotide before DNA Pol I can replace a portion of the strand. Is needed to repair chemical damage in DNA effecting more than one nucleotide, such as c...

NBME Practice MCB Questions and answers A 2 year old girl who is exposed to the sun has progressive development of dryness of the skin, excessive freckling, and keratoses. Skin fibroblasts cultured from this child are most likely to be defective in which of the following? Nuclear excision repair of pyrimidine dimers a 65 year old man has a radical prostacetomy and lymph node dissection for adenocarcinoma of the prostate. which of the following features is involved in the grading of this neo...

Bond between phosphate and sugar? - phosphodiester Bond between sugar and base? - glycosidic Non-covalent interactions? - H bonding, base stacking, electrostatic interactions Chargaff rules? - purine content = pyrimidine content adenine = thymine guanine = cytosine

Adenine - A purine base, forms a base pair with thymine in DNA and with uracil in RNA Guanine - Purine base that pairs with cytosine in DNA and RNA. Cytosine - Pyrimidine base that pairs with Guanine with DNA and RNA. Thymine - Pyrimidine base that pairs with Adenine in DNA. Uracil - Pyrimidine base that pairs with Uracil in RNA. nucleoside - base + sugar nucleotide - base + sugar + phosphate

Pyrimidine - ANSWER one carbon ring Cytosine, Thymine, Uracil Purine - ANSWER two carbon rings Adenine, Guanine How are nucleotides joined together? - ANSWER condensation What does mRNA do? - ANSWER carries code out of cell. code for protein structure. DNA to ribosomes end of transcription start of translation

Pyrimidine dimers formed in DNA due to UV radiation can be repaired by? SOS repair Double strand break repair Mismatch repair Photoreactivation repair (nucleotide excision repair) Base excision repair - CORRECT ANSWER Photoreactivation repair (nucleotide excision repair) Which of the following repair mechanisms uses methyl groups to distinguish between parental and daughter strands? Answers: Mismatch repair Photoreactivation repair (Nucleotide excision repair) SOS repair Doub...