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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. Circular and double stranded






2. Gprotein association - exchanges GDP to GTP - converts AMP into cyclic AMP. Cyclic AMP binds to protein kinase A: Protein kinase A phosphorylates phosphorylase kinase. increases Ca which binds calmodulin proteins which then binds to phosphorylase kin






3. PKa = pH






4. RNA protein-complex






5. Makes Acetyl-CoA from pyruvate






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






7. Krebs cycle enzyme






8. 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






9. Can serve as a primer

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10. Gene duplication






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






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






13. 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






14. Cleaves on C terminal side of lysine and arginine






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






16. 1e-14






17. Val - Leu - Ile - Ala - Met






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






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






21. Secondary messenger - used for intracellular signal transduction - such as transferring the effects of hormones like glucagon and adrenaline - which cannot pass through the cell membrane. It is involved in the activation of protein kinases and regula






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






23. Operon 1/2 - gene 1/6






24. 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.






25. Vitamin B1 - cofactor that aids in dehydrogenase mostly






26. Measures physical base pair distance






27. Gene has multiple effects






28. Repeated replication w/o cell division






29. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






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






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






33. 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 -






34. Ser - Cys - Thr - Gln - Asn






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






36. MRNA






37. Irreversible reaction that require ATP first part of glycolosis






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






39. Only one carbon center is changed






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






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






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






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






44. Failure of chromosome pairs to separate during meiosis






45. Isoelectric point and MW






46. Can undergo both lytic and lysogenic cycle






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






48. Do not contain F factor






49. Enzymes in Krebs cycle that produce NADH






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