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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. Enter cells freely






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






3. Gene duplication






4. 1e-14






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






6. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






8. 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






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






10. Actin - myosin - and other muscle proteins






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






12. Derived from golgi vesicles






13. MRNA






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






15. Operon 1/2 - gene 1/6






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






17. Isoelectric point and MW






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






19. PKa = pH






20. 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






21. Ser - Cys - Thr - Gln - Asn






22. Vitamin B1 - cofactor that aids in dehydrogenase mostly






23. 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.






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






25. Only one carbon center is changed






26. Cleaves on C terminal side of lysine and arginine






27. Measures physical base pair distance






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






29. 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






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






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






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






33. Failure of chromosome pairs to separate during meiosis






34. Makes Acetyl-CoA from pyruvate






35. Can serve as a primer






36. Circular and double stranded






37. Enzymes in Krebs cycle that produce NADH






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






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






40. Triglycerides - cholesterols - and phospholipids






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






42. RNA protein-complex






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






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






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






46. Gene has multiple effects






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






48. Neutralizes H2O2 - found in lysosomes






49. Irreversible reaction that require ATP first part of glycolosis






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