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






2. Irreversible reaction that require ATP first part of glycolosis






3. Repeated replication w/o cell division






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






5. 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






6. Possess an F plasmid that also includes some DNA taken from the bacterial genome. Sometimes it is formed by incorrect excision from the chromosome


7. Enzymes in Krebs cycle that produce NADH






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






9. Gene has multiple effects






10. Actin - myosin - and other muscle proteins






11. Derived from golgi vesicles






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






13. Val - Leu - Ile - Ala - Met






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






15. Phe - Trp - Tyr - Gly - Pro






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






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






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






19. RNA protein-complex






20. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






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






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






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






26. Isoelectric point and MW






27. Do not contain F factor






28. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






30. Gene duplication






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






32. 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.






33. Enter cells freely






34. Operon 1/2 - gene 1/6






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






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






37. 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






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






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






40. Circular and double stranded






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






42. 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 -






43. Krebs cycle enzyme






44. 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






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. Contain their own DNA - mRNA - and proteins to synthesize more






47. Cleaves on C terminal side of lysine and arginine






48. Neutralizes H2O2 - found in lysosomes






49. 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.






50. Can serve as a primer