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GRE Biochemistry

Subjects : gre, science
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  • Answer 50 questions in 15 minutes.
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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. Operon 1/2 - gene 1/6






2. Enter cells freely






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






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






5. Irreversible reaction that require ATP first part of glycolosis






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






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






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






9. 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.






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






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






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






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






14. Do not contain F factor






15. 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






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






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






18. Triglycerides - cholesterols - and phospholipids






19. Isoelectric point and MW






20. Cleaves on C terminal side of lysine and arginine






21. Makes Acetyl-CoA from pyruvate






22. 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






23. 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






24. 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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25. FAD-2 - NADP-3






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






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






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






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






30. Phe - Trp - Tyr - Gly - Pro






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






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






33. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






34. 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.






35. 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






36. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






38. Failure of chromosome pairs to separate during meiosis






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






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






41. PKa = pH






42. Gene has multiple effects






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






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






45. MRNA






46. Can serve as a primer

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47. Enzymes in Krebs cycle that produce NADH






48. Neutralizes H2O2 - found in lysosomes






49. Ser - Cys - Thr - Gln - Asn






50. Krebs cycle enzyme







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