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






2. Repeated replication w/o cell division






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






5. Can undergo both lytic and lysogenic cycle






6. 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






7. 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.






8. 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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9. Do not contain F factor






10. Val - Leu - Ile - Ala - Met






11. Makes Acetyl-CoA from pyruvate






12. Vitamin B1 - cofactor that aids in dehydrogenase mostly






13. Circular and double stranded






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






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






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






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






18. 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 -






19. Cleaves on C terminal side of lysine and arginine






20. Irreversible reaction that require ATP first part of glycolosis






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






22. Ser - Cys - Thr - Gln - Asn






23. 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






24. Only one carbon center is changed






25. Derived from golgi vesicles






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






27. FAD-2 - NADP-3






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






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






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






31. 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.






32. Actin - myosin - and other muscle proteins






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






34. MRNA






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






36. Operon 1/2 - gene 1/6






37. Isoelectric point and MW






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






39. Measures physical base pair distance






40. Can serve as a primer

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






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






43. Krebs cycle enzyme






44. Gene has multiple effects






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






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






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






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






49. Enter cells freely






50. Neutralizes H2O2 - found in lysosomes