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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. Val - Leu - Ile - Ala - Met






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






3. Repeated replication w/o cell division






4. Triglycerides - cholesterols - and phospholipids






5. MRNA






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






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






8. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






10. Cleaves on C terminal side of lysine and arginine






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






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






14. Can undergo both lytic and lysogenic cycle






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






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






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






18. Ser - Cys - Thr - Gln - Asn






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






20. 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 -






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






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






23. Failure of chromosome pairs to separate during meiosis






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






25. Enter cells freely






26. 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






27. FAD-2 - NADP-3






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






29. Gene has multiple effects






30. Only one carbon center is changed






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






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. 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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34. Derived from golgi vesicles






35. Actin - myosin - and other muscle proteins






36. RNA protein-complex






37. Krebs cycle enzyme






38. 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.






39. Can serve as a primer

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






41. PKa = pH






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






43. Isoelectric point and MW






44. Gene duplication






45. 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






46. Circular and double stranded






47. Makes Acetyl-CoA from pyruvate






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






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






50. Irreversible reaction that require ATP first part of glycolosis