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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. Neutralizes H2O2 - found in lysosomes






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. Serine protease that cleaves on c terminal side of aromatics






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






5. Krebs cycle enzyme






6. Can serve as a primer






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






8. 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






9. Can undergo both lytic and lysogenic cycle






10. FAD-2 - NADP-3






11. Do not contain F factor






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






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






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






15. 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 -






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






17. Measures physical base pair distance






18. Circular and double stranded






19. 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.






20. Val - Leu - Ile - Ala - Met






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






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






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






24. Vitamin B1 - cofactor that aids in dehydrogenase mostly






25. Gene has multiple effects






26. Triglycerides - cholesterols - and phospholipids






27. Makes Acetyl-CoA from pyruvate






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






29. 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






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






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






32. MRNA






33. Derived from golgi vesicles






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






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






36. 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






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






38. Cleaves on C terminal side of lysine and arginine






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






40. Enter cells freely






41. Only one carbon center is changed






42. Repeated replication w/o cell division






43. Phe - Trp - Tyr - Gly - Pro






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






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






46. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






48. Ser - Cys - Thr - Gln - Asn






49. 1e-14






50. 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