Purine or pyrimidine - Study guides, Class notes & Summaries

Nucleus ~:- contains the nucleolus, a small dense structure composed largely of RNA, most of the cellular DNA, and the DNA-binding proteins, the histones, that regulate its activity What 4 elements is DNA composed of? ~:- 1) deoxyribose phosphate molecule 2) pyrimidine bases 3) purine bases 4) hydrogen bonds (stabilize the helix through large numbers) what are Ribosomes? ~:- RNA-protein complexes (nucleoproteins) that are synthesized in the nucleolus and secreted into the cytopla...

PRELIMS LEC Exam Questions and Answers 2024 b. Ribose, deoxyribose - Answer-The sugar component in RNA is______, while ______in DNA. a. Ribose, bases b. Ribose, deoxyribose c. Deoxyribose, ribose d. Phosphate, ribose c. Both covalently and hydrogen bonded to a sugar - Answer-Nucleoside is a pyrimidine or purine base a. Ionically bonded to a sugar b. Hydrogen bonded to a sugar c. Both covalently and hydrogen bonded to a sugar d. Covalently bonded to a sugar b. Connect the sugar to th...

PRELIMS LEC Exam Questions and Answers 2024 b. Ribose, deoxyribose - Answer-The sugar component in RNA is______, while ______in DNA. a. Ribose, bases b. Ribose, deoxyribose c. Deoxyribose, ribose d. Phosphate, ribose c. Both covalently and hydrogen bonded to a sugar - Answer-Nucleoside is a pyrimidine or purine base a. Ionically bonded to a sugar b. Hydrogen bonded to a sugar c. Both covalently and hydrogen bonded to a sugar d. Covalently bonded to a sugar b. Connect the sugar to th...

Biochemistry Section-USMLE Step 1 2024 Questions and Answers which histone ties DNA-histone nucleosome beads into more condensed structures? - answerH1 is DNA acidic or basic? - answeracidic what type of aa are histones made of? are they acidic or basic? - answerlysine and arginine; basic is heterochromatic more accessible or less accessible to TF? euchromatin? - answerless; more if a cell has a hyperchromatic or condensed nucleus is it undergoing transcription etc? - answerno what ar...

TEST BANK ANATOMY AND PHYSIOLOGY OPENSTAX Table of Contents 1. An Introduction to the Human Body ................................................................................................................. 2 2. The Chemical Level of Organization ................................................................................................................ 7 3. The Cellular Level of Organization ..................................................................................................

PMC exam 5 questions & answers 2024/2025 Nucleoside/Nucleotide Reverse Transcriptase Inhibitors (NRTIs) - ANSWERSHas two active (catalytic) sites: The RNase H (RNA-cleaving) active site and the DNA polymerase (DNA-synthesizing) active site. Both activities are needed to reverse-transcribe HIV's RNA-based genomic material into DNA. either purine or pyrimidine derivatives of natural DNA monomers. bind to the DNA polymerase catalytic site of the reverse transcriptase enzyme. As a result...

Are the R groups non polar, polar, or it depends on the type of amino acid? depends How many amino acids are there? How many are essential? How many are nonessential? 20 total. 10 essential. 10 nonessential. What basic elements are usually found in all carbohydrate examples? Carbon, hydrogen, oxygen Fructose and Glucose are very similar but what is the difference? Fructose has 5 rings Glucose has 6 rings Which molecule or elements are missing from maltose versus ...

USMLE- BIOCHEMISTRY- EXAM 3 REVIEW | WITH 100% CORRECT ANSWERS | LATEST UPDATE | GRADED A+ 1 Q Which of the following statements about Purine and Pyrimidine biosynthesis and metabolism is correct (or True)? (Select all that apply) A: Antifolate drugs and Glutamine analogs block purine nucleotide biosynthesis. B: PRPP (phosphoribosylpyrophosphate) synthase phosphorylates the anomeric OH group of Ribose 5’-phosphate. C: cAMP and cGMP feedback regulate their formation from IMP (Ino...

USLME – Biochemistry Exam Questions With Accurate Answers. Amino acids necessary for purine synthesis - answerGlycine Aspartate Glutamine Leflunomide MOA - answerinhibits dihydroorotate dehydrogenase 5-fluorouracil and capecitabine (its prodrug) MOA - answerForm 5-F-dUMP which inhibits thymidylate synthase (therefore decreasing dTMP) Adenosine deaminase deficiency (Pathogenesis, presentation) - answerADA needed for degradation of adenosine Deficiency causes: excess ATP and dATP --&gt...

Bio 107 Exam 1 Questions with Correct Answers Graded A+ What does a nucleotide structure have? Nitrogenous base Sugar Phosphate group What do nucleotides form when they are chemically connected together? DNA strand What are the two nitrogenous bases? Pyrimidine and Purine What is included in the pyrimidine group? Cytosine (C) Thymine (T) Uracil (U) What is included in the purine group? Adenine (A) Guanine (G) Which of the following is only included in the DNA group C, T, U, A, or G?...