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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. 1e-14






2. Circular and double stranded






3. FAD-2 - NADP-3






4. Vitamin B1 - cofactor that aids in dehydrogenase mostly






5. 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






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






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






8. PKa = pH






9. 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






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






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






13. Gene has multiple effects






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






15. Cleaves on C terminal side of lysine and arginine






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






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






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






19. Operon 1/2 - gene 1/6






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






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






22. 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 -






23. Only one carbon center is changed






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






25. Enzymes in Krebs cycle that produce NADH






26. Do not contain F factor






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






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






29. Irreversible reaction that require ATP first part of glycolosis






30. RNA protein-complex






31. Val - Leu - Ile - Ala - Met






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. Can serve as a primer

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34. Measures physical base pair distance






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






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






37. Failure of chromosome pairs to separate during meiosis






38. Phe - Trp - Tyr - Gly - Pro






39. Can undergo both lytic and lysogenic cycle






40. Krebs cycle enzyme






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






42. 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






43. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






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






46. Gene duplication






47. Triglycerides - cholesterols - and phospholipids






48. Repeated replication w/o cell division






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






50. 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.