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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. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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


3. Only one carbon center is changed






4. 1e-14






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






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






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






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






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






10. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






11. 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






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






13. 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






14. Failure of chromosome pairs to separate during meiosis






15. 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






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






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






18. Enter cells freely






19. 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 -






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






21. 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.






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






23. Gene duplication






24. Triglycerides - cholesterols - and phospholipids






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






26. Derived from golgi vesicles






27. RNA protein-complex






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






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






30. Gene has multiple effects






31. PKa = pH






32. Isoelectric point and MW






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






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






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






36. Actin - myosin - and other muscle proteins






37. Enzymes in Krebs cycle that produce NADH






38. Makes Acetyl-CoA from pyruvate






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






40. Do not contain F factor






41. Repeated replication w/o cell division






42. FAD-2 - NADP-3






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






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






45. Val - Leu - Ile - Ala - Met






46. Phe - Trp - Tyr - Gly - Pro






47. Can undergo both lytic and lysogenic cycle






48. Irreversible reaction that require ATP first part of glycolosis






49. 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.






50. Measures physical base pair distance