Purine or pyrimidine Study guides, Class notes & Summaries
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PRELIMS LEC Exam Questions and Answers 2024
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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...
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USMLE- BIOCHEMISTRY- EXAM 3 REVIEW | WITH 100% CORRECT ANSWERS | LATEST UPDATE | GRADED A+
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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...
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ATI TEAS 7 Biology Review: Latest Updated A+ Guide : 100% Verified
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Macromolecules: 
Carbohydrate, Lipid, Nucleic Acid, Protein, Enzyme 
Carbohydrate: Sugars and starches which body breaks down to glucose 
● Structural function: cellulose and chitin 
● Energy storage: amylose, amylopectin, glycogen 
● Recognition molecules: glycoproteins and glycolipids 
Lipids: Fatty acids and their derivatives that are soluble in 
water 
● H and C and main components 
● Fats 
● Hydrophobic- thus help separate aqueous compartments 
● Store energy (fats, oils, adip...
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PMC exam 5 questions & answers 2024/2025
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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...
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Bio 107 Exam 1 Questions with Correct Answers Graded A+
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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?...
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Anatomy LAB BIOS 1300 Ohio University first exam study guide questions and answers(latest update)
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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 ...
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USLME – Biochemistry Exam Questions With Accurate Answers.
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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 -->...
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Molecular Diagnostics EXAM GRADED A+
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Molecular Diagnostics EXAM 
GRADED A+ 
nucleoside vs nucleotide - ANSWERnucleoside: base + sugar (A,G,C,T) - 
sine/dine 
nucletide: base + sugar + phosphate(s) (AMP,GMP,etc) -ylate 
components required for synthesis of pyrimidine - ANSWERN1, C4, C5, C6: 
aspartate 
C2: CO2 
N3: glutamine 
does not require much energy 
components required for synthesis of purine - ANSWER3NH3's: 2 glutamine, 
1 fumarate 
N¹⁰ formyl-THF, CO2 
glycine 
requires 7 or 8 ATP's 
degredation of pyrimidines - ANSWER*...
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MMSC 491 EXAM 1 /WELL STRUCTURED QUESTIONS AND CORRECT ANSWERS 2024/2025 GRADED A+.
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MMSC 491 EXAM 1 /WELL 
STRUCTURED QUESTIONS AND 
CORRECT ANSWERS 2024/2025 
GRADED A+. 
2 / 6 
1. Epigenetic: Changes in phenotypeHeritable 
Not due to changes in DNA sequence DNA 
methylation or histone modification 
2. Collective term for all different DNA molecules within a cell or organism: - 
Genome 
3. DNA protein complex: Chromosome 
4. How many DNA molecules does a male have? female have?: Male 25Female 24 
5. Single ring based on carbon and nitrogen atoms 
C,T: Pyrimidine 
6. Double rin...
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Helix Practice Test Questions & Answers 2024/2025
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Helix Practice Test Questions & Answers 2024/2025 
 
 
Avery's experiments would show that - ANSWERSall genes were composed of DNA 
 
Luria's experiments largely dealt with the - ANSWERSmultiplication of bacterial viruses 
 
After first talking to Crick, he and Watson decided DNA could be solved - ANSWERSin a simple way 
 
in the alpha helix, a single polypeptide chain folds into a - ANSWERShelical arrangement held together by hydrogen bonds between groups on the same chain 
 
Maurice told Fra...
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