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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. Gene duplication






2. Enter cells freely






3. Enzymes in Krebs cycle that produce NADH






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






5. PKa = pH






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






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






8. Isoelectric point and MW






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






10. Measures physical base pair distance






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






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






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






15. FAD-2 - NADP-3






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






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






18. 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.






19. 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






20. Irreversible reaction that require ATP first part of glycolosis






21. 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 -






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






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






24. Gene has multiple effects






25. Krebs cycle enzyme






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






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






28. Vitamin B1 - cofactor that aids in dehydrogenase mostly






29. Failure of chromosome pairs to separate during meiosis






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






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






32. Actin - myosin - and other muscle proteins






33. Phe - Trp - Tyr - Gly - Pro






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






35. 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.






36. Cleaves on C terminal side of lysine and arginine






37. 1e-14






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






39. Circular and double stranded






40. Triglycerides - cholesterols - and phospholipids






41. Derived from golgi vesicles






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






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






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






45. Can undergo both lytic and lysogenic cycle






46. Ser - Cys - Thr - Gln - Asn






47. 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.






48. 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






49. Operon 1/2 - gene 1/6






50. Do not contain F factor