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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. Repeated replication w/o cell division






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






3. 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.






4. Only one carbon center is changed






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






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. Krebs cycle enzyme






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






9. Enzymes in Krebs cycle that produce NADH






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






11. Irreversible reaction that require ATP first part of glycolosis






12. Can serve as a primer


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


14. 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






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






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






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 transport of tRNA and mRNA down the ribosome in prokaryotes






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






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






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






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






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






24. MRNA






25. Triglycerides - cholesterols - and phospholipids






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






27. 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.






28. PKa = pH






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






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






31. Enter cells freely






32. Circular and double stranded






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






34. 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






35. Measures physical base pair distance






36. Do not contain F factor






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






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






39. Gene has multiple effects






40. Isoelectric point and MW






41. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






42. Operon 1/2 - gene 1/6






43. 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






44. FAD-2 - NADP-3






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






46. Cleaves on C terminal side of lysine and arginine






47. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






49. Phe - Trp - Tyr - Gly - Pro






50. 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.