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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. 1e-14






3. 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






4. 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.






5. Cleaves on C terminal side of lysine and arginine






6. 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 -






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






8. MRNA






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






10. Krebs cycle enzyme






11. 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






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






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






14. Isoelectric point and MW






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






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






17. Makes Acetyl-CoA from pyruvate






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






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






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






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






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






23. Neutralizes H2O2 - found in lysosomes






24. PKa = pH






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






26. Only one carbon center is changed






27. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






29. Circular and double stranded






30. RNA protein-complex






31. Measures physical base pair distance






32. 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.






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






34. Can undergo both lytic and lysogenic cycle






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






36. Can serve as a primer

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






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






39. Operon 1/2 - gene 1/6






40. Actin - myosin - and other muscle proteins






41. 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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42. Gene has multiple effects






43. Triglycerides - cholesterols - and phospholipids






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






45. Failure of chromosome pairs to separate during meiosis






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






47. Derived from golgi vesicles






48. Ser - Cys - Thr - Gln - Asn






49. 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






50. Repeated replication w/o cell division