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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. 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






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






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






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






5. RNA protein-complex






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






7. Gene has multiple effects






8. Cleaves on C terminal side of lysine and arginine






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






10. Vitamin B1 - cofactor that aids in dehydrogenase mostly






11. 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.






12. 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.






13. Enter cells freely






14. Ser - Cys - Thr - Gln - Asn






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






16. Isoelectric point and MW






17. Operon 1/2 - gene 1/6






18. Only one carbon center is changed






19. Makes Acetyl-CoA from pyruvate






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






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


22. Gene duplication






23. FAD-2 - NADP-3






24. 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






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






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






27. Neutralizes H2O2 - found in lysosomes






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






29. 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






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






31. Krebs cycle enzyme






32. Val - Leu - Ile - Ala - Met






33. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






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






36. Circular and double stranded






37. Failure of chromosome pairs to separate during meiosis






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






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






40. Enzymes in Krebs cycle that produce NADH






41. MRNA






42. Phe - Trp - Tyr - Gly - Pro






43. Derived from golgi vesicles






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






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






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






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






48. Measures physical base pair distance






49. 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.






50. 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 -