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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. 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






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






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






4. Neutralizes H2O2 - found in lysosomes






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






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






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






8. Enzymes in Krebs cycle that produce NADH






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






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






11. Can undergo both lytic and lysogenic cycle






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






13. Gene duplication






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






15. Can result in allele differences - suce as 3:1 and 1:3






16. Operon 1/2 - gene 1/6






17. Makes Acetyl-CoA from pyruvate






18. Triglycerides - cholesterols - and phospholipids






19. Val - Leu - Ile - Ala - Met






20. Phosphotransferase - is a type of enzyme that transfers phosphate groups from high-energy donor molecules - such as ATP -[2] to specific substrates. The process is referred to as phosphorylation -






21. PKa = pH






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






23. Krebs cycle enzyme






24. Can serve as a primer

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






26. Measures physical base pair distance






27. Catalyzes the transport of tRNA and mRNA down the ribosome in prokaryotes






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






29. Actin - myosin - and other muscle proteins






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






31. Recruits RecA protein - inhibited by LexA - results in mutagenesis






32. Phe - Trp - Tyr - Gly - Pro






33. 1e-14






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






35. FAD-2 - NADP-3






36. MRNA






37. 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.






38. Gene has multiple effects






39. Isoelectric point and MW






40. Enter cells freely






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






42. Derived from golgi vesicles






43. 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






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






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






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






47. Nuclear lamins - desmins - keratins - internexins (structure)






48. Ser - Cys - Thr - Gln - Asn






49. Cleaves on C terminal side of lysine and arginine






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