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GRE Biochemistry

Subjects : gre, science
Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Catalyzes the transport of tRNA and mRNA down the ribosome in prokaryotes






2. Enzymes in Krebs cycle that produce NADH






3. PKa = pH






4. Vitamin B1 - cofactor that aids in dehydrogenase mostly






5. Unwound - participates in the active transcription of DNA to mRNA products - site of RNA Pol II regulation






6. Operon 1/2 - gene 1/6






7. Enter cells freely






8. Serine protease that cleaves on c terminal side of aromatics






9. Phe - Trp - Tyr - Gly - Pro






10. Makes Acetyl-CoA from pyruvate






11. Irreversible reaction that require ATP first part of glycolosis






12. Val - Leu - Ile - Ala - Met






13. Preferable to hydrolysis (like in the breakdown of glycogen or starch - as in the example above) because glucose 1-phosphate yields more ATP than does free glucose when subsequently catabolized to pyruvate.






14. 1e-14






15. Krebs cycle enzyme






16. Tightly packed form of DNA - less accessible to protein factors that usually bind DNA






17. It uncouples oxidative phosphorylation by carrying protons across the mitochondrial membrane - leading to a rapid consumption of energy without generation of ATP.






18. Gene has multiple effects






19. Triglycerides - cholesterols - and phospholipids






20. Dynins and kinesins (movement) - cilia and flagella






21. MRNA






22. An enzyme that removes a phosphate group from its substrate






23. (His - Arg - Lys +) - (Glu - Asp -)






24. Possess an F plasmid that also includes some DNA taken from the bacterial genome. Sometimes it is formed by incorrect excision from the chromosome

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25. Only one carbon center is changed






26. Catalyzes the addition of bicarbonate to phosphoenolpyruvate (PEP) to form the four-carbon compound oxaloacetate






27. The most important regulatory enzyme of glycolysis. It is an allosteric enzyme made of 4 subunits and controlled by many activators and inhibitors. PFK-1 catalyzes the important 'committed' step of glycolysis - the conversion of fructose 6-phosphate






28. Contain their own DNA - mRNA - and proteins to synthesize more






29. Repeated replication w/o cell division






30. When exons are arranged in multiple orders after removal of introns






31. Derived from golgi vesicles






32. Cis faces the ER and trans faces the plasma membrane






33. Cleaves on C terminal side of lysine and arginine






34. Gene duplication






35. Do not contain F factor






36. Vitamin B7 - cofactor that aids in CO2 transfer (carboxylase)






37. Regulator of glycolysis when glucose is low by cleaving 2;6 BPG lowering PFK1 - opposite effect when glucose is high






38. Non-protein chemical compound that is bound to a protein and is required for the protein'S biological activity






39. Can undergo both lytic and lysogenic cycle






40. Catalyzes the transport of tRNA and mRNA down the ribosome in eukaryotes






41. Can serve as a primer

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42. Acts as a coenzyme in all transamination reactions - and in some decarboxylation and deamination reactions of amino acids. The aldehyde group of PLP forms a Schiff-base linkage (internal aldimine) with the e-amino group of a specific lysine group of






43. Possess F factor as a plasmid independent of the bacterial genome. The F plasmid contains only F factor DNA and no DNA from the bacterial genome.






44. = pKa+ log(B/A) - -log(Ka)






45. Possess F factor integrated into the bacterial genome. After integration into the host chromosomal DNA - these plasmids possess portions of - or entire - F factor and portions of the bacterial genome.






46. Catalyzes the irreversible carboxylation of pyruvate to oxaloacetate (OAA).






47. Acetyl-CoA to malonyl-CoA - rate limiting step in fatty acid synthesis






48. Recognizes and targets specific proteins to the endoplasmic reticulum in eukaryotes and the plasma membrane in prokaryotes






49. Donates electrons to form a bond such as N in amines and O in alcohols






50. Measure tendency for recombination (frequency) 1cM = 1% chance of being separated