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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. Failure of chromosome pairs to separate during meiosis






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






3. Can serve as a primer

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






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






6. Do not contain F factor






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






8. Irreversible reaction that require ATP first part of glycolosis






9. Enzymes in Krebs cycle that produce NADH






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






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. 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






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






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






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






16. Triglycerides - cholesterols - and phospholipids






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






18. Gene duplication






19. Krebs cycle enzyme






20. 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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21. Phe - Trp - Tyr - Gly - Pro






22. Can undergo both lytic and lysogenic cycle






23. 1e-14






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






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






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






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






28. Gene has multiple effects






29. 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.






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






31. Val - Leu - Ile - Ala - Met






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






33. Actin - myosin - and other muscle proteins






34. Circular and double stranded






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






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






37. Derived from golgi vesicles






38. 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






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






40. Makes Acetyl-CoA from pyruvate






41. 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.






42. Operon 1/2 - gene 1/6






43. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






44. 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.






45. FAD-2 - NADP-3






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






47. MRNA






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






49. Neutralizes H2O2 - found in lysosomes






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