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






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






3. 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






4. 1e-14






5. Measures physical base pair distance






6. Vitamin B1 - cofactor that aids in dehydrogenase mostly






7. Repeated replication w/o cell division






8. Actin - myosin - and other muscle proteins






9. FAD-2 - NADP-3






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






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






12. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






14. Irreversible reaction that require ATP first part of glycolosis






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






16. Val - Leu - Ile - Ala - Met






17. Derived from golgi vesicles






18. Operon 1/2 - gene 1/6






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






20. 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.






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






22. Ser - Cys - Thr - Gln - Asn






23. 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






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






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






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






27. Do not contain F factor






28. Krebs cycle enzyme






29. Can undergo both lytic and lysogenic cycle






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






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






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






33. Makes Acetyl-CoA from pyruvate






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






35. 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 -






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






37. Gene has multiple effects






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






39. Catalyze the phosphorylation of tyrosine residues in proteins - involved in signal cascades






40. Can serve as a primer

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






42. 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.






43. PKa = pH






44. Phe - Trp - Tyr - Gly - Pro






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






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






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






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






49. Circular and double stranded






50. Failure of chromosome pairs to separate during meiosis