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






2. 1e-14






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






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






5. Krebs cycle enzyme






6. Derived from golgi vesicles






7. Only one carbon center is changed






8. PKa = pH






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






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






12. Isoelectric point and MW






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






14. Neutralizes H2O2 - found in lysosomes






15. Irreversible reaction that require ATP first part of glycolosis






16. Ser - Cys - Thr - Gln - Asn






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






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






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






20. Operon 1/2 - gene 1/6






21. Val - Leu - Ile - Ala - Met






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






23. Gene duplication






24. Can serve as a primer






25. 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






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






27. Vitamin B1 - cofactor that aids in dehydrogenase mostly






28. Measures physical base pair distance






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






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






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






32. RNA protein-complex






33. Enter cells freely






34. Failure of chromosome pairs to separate during meiosis






35. Enzymes in Krebs cycle that produce NADH






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






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






38. Makes Acetyl-CoA from pyruvate






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






40. Can undergo both lytic and lysogenic cycle






41. Phe - Trp - Tyr - Gly - Pro






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






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






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






45. Actin - myosin - and other muscle proteins






46. 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






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






48. Cleaves on C terminal side of lysine and arginine






49. 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






50. 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.