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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. Cleaves on C terminal side of lysine and arginine






2. Gene duplication






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






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






5. Measures physical base pair distance






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






7. Triglycerides - cholesterols - and phospholipids






8. Gene has multiple effects






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






10. 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.






11. Enter cells freely






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






13. Can undergo both lytic and lysogenic cycle






14. Circular and double stranded






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






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






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






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






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






20. Krebs cycle enzyme






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






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






23. MRNA






24. 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






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






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






27. PKa = pH






28. 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






29. Do not contain F factor






30. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






32. 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.






33. FAD-2 - NADP-3






34. Actin - myosin - and other muscle proteins






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






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






37. 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.






38. Isoelectric point and MW






39. 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






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






41. 1e-14






42. Neutralizes H2O2 - found in lysosomes






43. Val - Leu - Ile - Ala - Met






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






45. 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 -






46. RNA protein-complex






47. Makes Acetyl-CoA from pyruvate






48. Derived from golgi vesicles






49. Enzymes in Krebs cycle that produce NADH






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