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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. 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.






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






3. Neutralizes H2O2 - found in lysosomes






4. Vitamin B1 - cofactor that aids in dehydrogenase mostly






5. Ser - Cys - Thr - Gln - Asn






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






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






8. Phe - Trp - Tyr - Gly - Pro






9. Val - Leu - Ile - Ala - Met






10. 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






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






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






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






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






15. Enzymes in Krebs cycle that produce NADH






16. Operon 1/2 - gene 1/6






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






18. Derived from golgi vesicles






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






20. Cleaves on C terminal side of lysine and arginine






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






22. Only one carbon center is changed






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. Measures physical base pair distance






25. Failure of chromosome pairs to separate during meiosis






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






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






28. 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






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






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






31. Circular and double stranded






32. Do not contain F factor






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






34. 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 -






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






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






37. Can undergo both lytic and lysogenic cycle






38. Irreversible reaction that require ATP first part of glycolosis






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






40. Krebs cycle enzyme






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






42. 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






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






44. Can serve as a primer






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






46. Enter cells freely






47. PKa = pH






48. Gene duplication






49. Isoelectric point and MW






50. 1e-14