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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. Cis faces the ER and trans faces the plasma membrane






2. 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






3. Circular and double stranded






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






5. Can undergo both lytic and lysogenic cycle






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






7. Enzymes in Krebs cycle that produce NADH






8. 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.






9. Makes Acetyl-CoA from pyruvate






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






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. FAD-2 - NADP-3






13. Vitamin B1 - cofactor that aids in dehydrogenase mostly






14. Gene has multiple effects






15. Do not contain F factor






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






17. 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.






18. Failure of chromosome pairs to separate during meiosis






19. 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






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






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






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






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






24. 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






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






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






27. Derived from golgi vesicles






28. Triglycerides - cholesterols - and phospholipids






29. Krebs cycle enzyme






30. 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






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






32. MRNA






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






34. PKa = pH






35. 1e-14






36. 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 -






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






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






39. Isoelectric point and MW






40. Cleaves on C terminal side of lysine and arginine






41. Enter cells freely






42. Neutralizes H2O2 - found in lysosomes






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






44. Val - Leu - Ile - Ala - Met






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






46. Phe - Trp - Tyr - Gly - Pro






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






48. Irreversible reaction that require ATP first part of glycolosis






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






50. Only one carbon center is changed







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