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






2. 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.






3. PKa = pH






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






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






6. FAD-2 - NADP-3






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






8. Val - Leu - Ile - Ala - Met






9. Can serve as a primer


10. 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






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






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






13. Irreversible reaction that require ATP first part of glycolosis






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






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






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






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






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






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






20. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






21. 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






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






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






24. Neutralizes H2O2 - found in lysosomes






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






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






27. Operon 1/2 - gene 1/6






28. Repeated replication w/o cell division






29. 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.






30. Possess an F plasmid that also includes some DNA taken from the bacterial genome. Sometimes it is formed by incorrect excision from the chromosome


31. Measures physical base pair distance






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






33. Only one carbon center is changed






34. Triglycerides - cholesterols - and phospholipids






35. Gene has multiple effects






36. Krebs cycle enzyme






37. Derived from golgi vesicles






38. 1e-14






39. RNA protein-complex






40. Isoelectric point and MW






41. Circular and double stranded






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






43. Actin - myosin - and other muscle proteins






44. Enzymes in Krebs cycle that produce NADH






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






46. Cleaves on C terminal side of lysine and arginine






47. 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






48. 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 -






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






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