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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. Vitamin B1 - cofactor that aids in dehydrogenase mostly






2. 1e-14






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






4. 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






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






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






7. Can serve as a primer


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






9. Enter cells freely






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






11. Do not contain F factor






12. Cleaves on C terminal side of lysine and arginine






13. 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.






14. Krebs cycle enzyme






15. Makes Acetyl-CoA from pyruvate






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






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






18. 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.






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






20. Repeated replication w/o cell division






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






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


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






24. MRNA






25. Measures physical base pair distance






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






27. FAD-2 - NADP-3






28. 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






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






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






31. Gene duplication






32. 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






33. Gene has multiple effects






34. Isoelectric point and MW






35. Neutralizes H2O2 - found in lysosomes






36. 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.






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






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






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






40. Val - Leu - Ile - Ala - Met






41. PKa = pH






42. Can undergo both lytic and lysogenic cycle






43. Enzymes in Krebs cycle that produce NADH






44. Failure of chromosome pairs to separate during meiosis






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






46. Circular and double stranded






47. 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 -






48. Derived from golgi vesicles






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






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