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






2. Measures physical base pair distance






3. RNA protein-complex






4. Gene has multiple effects






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






6. 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






7. Ser - Cys - Thr - Gln - Asn






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






10. Irreversible reaction that require ATP first part of glycolosis






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






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






13. Val - Leu - Ile - Ala - Met






14. Can undergo both lytic and lysogenic cycle






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






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






17. 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 -






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






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






20. Failure of chromosome pairs to separate during meiosis






21. Makes Acetyl-CoA from pyruvate






22. 1e-14






23. 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.






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






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






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






27. Enter cells freely






28. Enzymes in Krebs cycle that produce NADH






29. Actin - myosin - and other muscle proteins






30. PKa = pH






31. Only one carbon center is changed






32. MRNA






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






34. Isoelectric point and MW






35. Phe - Trp - Tyr - Gly - Pro






36. Repeated replication w/o cell division






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






38. Do not contain F factor






39. Derived from golgi vesicles






40. Circular and double stranded






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






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






43. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






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






46. 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.






47. 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






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






49. FAD-2 - NADP-3






50. Krebs cycle enzyme