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






2. Do not contain F factor






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






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






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






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






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






8. 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






9. Repeated replication w/o cell division






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






11. Failure of chromosome pairs to separate during meiosis






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






13. Derived from golgi vesicles






14. Makes Acetyl-CoA from pyruvate






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






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






17. Enzymes in Krebs cycle that produce NADH






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






19. Cleaves on C terminal side of lysine and arginine






20. Enter cells freely






21. Irreversible reaction that require ATP first part of glycolosis






22. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






23. Actin - myosin - and other muscle proteins






24. 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.






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






26. Phe - Trp - Tyr - Gly - Pro






27. Can serve as a primer

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28. Only one carbon center is changed






29. MRNA






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






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






32. Circular and double stranded






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






34. 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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35. 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 -






36. 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.






37. RNA protein-complex






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






39. Can undergo both lytic and lysogenic cycle






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






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






42. Operon 1/2 - gene 1/6






43. Val - Leu - Ile - Ala - Met






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






45. Gene has multiple effects






46. FAD-2 - NADP-3






47. Isoelectric point and MW






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






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






50. 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.