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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. Repeated replication w/o cell division






2. Can serve as a primer


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






4. Operon 1/2 - gene 1/6






5. Krebs cycle enzyme






6. 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 -






7. Triglycerides - cholesterols - and phospholipids






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






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






10. 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






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






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






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






15. Val - Leu - Ile - Ala - Met






16. RNA protein-complex






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






18. Makes Acetyl-CoA from pyruvate






19. MRNA






20. Phe - Trp - Tyr - Gly - Pro






21. Isoelectric point and MW






22. Can undergo both lytic and lysogenic cycle






23. Only one carbon center is changed






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






25. 1e-14






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






27. 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.






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






29. Enter cells freely






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






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. Failure of chromosome pairs to separate during meiosis






34. 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.






35. Actin - myosin - and other muscle proteins






36. Gene has multiple effects






37. 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






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






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






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






41. Enzymes in Krebs cycle that produce NADH






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






43. Cleaves on C terminal side of lysine and arginine






44. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






46. FAD-2 - NADP-3






47. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






48. Circular and double stranded






49. Gene duplication






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