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






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






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






4. Isoelectric point and MW






5. Enter cells freely






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






7. 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






8. Measures physical base pair distance






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






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






11. 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.






12. Can undergo both lytic and lysogenic cycle






13. Val - Leu - Ile - Ala - Met






14. Gene has multiple effects






15. Actin - myosin - and other muscle proteins






16. Derived from golgi vesicles






17. 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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18. Serine protease that cleaves on c terminal side of aromatics






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






20. Phe - Trp - Tyr - Gly - Pro






21. Circular and double stranded






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






23. Ser - Cys - Thr - Gln - Asn






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






25. RNA protein-complex






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






27. 1e-14






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






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






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






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






32. Vitamin B1 - cofactor that aids in dehydrogenase mostly






33. 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






34. MRNA






35. PKa = pH






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






37. Krebs cycle enzyme






38. Enzymes in Krebs cycle that produce NADH






39. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






40. 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 -






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






42. 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.






43. Only one carbon center is changed






44. Do not contain F factor






45. Makes Acetyl-CoA from pyruvate






46. Repeated replication w/o cell division






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






48. Cleaves on C terminal side of lysine and arginine






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






50. Failure of chromosome pairs to separate during meiosis