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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. 1e-14






2. Do not contain F factor






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






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






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






6. Val - Leu - Ile - Ala - Met






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






8. Actin - myosin - and other muscle proteins






9. Only one carbon center is changed






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






11. 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.






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






13. Makes Acetyl-CoA from pyruvate






14. 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






15. Failure of chromosome pairs to separate during meiosis






16. Cleaves on C terminal side of lysine and arginine






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






18. 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 -






19. Isoelectric point and MW






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


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






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






23. Ser - Cys - Thr - Gln - Asn






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






25. Vitamin B1 - cofactor that aids in dehydrogenase mostly






26. MRNA






27. 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






28. Krebs cycle enzyme






29. Enzymes in Krebs cycle that produce NADH






30. 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






31. Measures physical base pair distance






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






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






34. Operon 1/2 - gene 1/6






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






36. PKa = pH






37. Gene duplication






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






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






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






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






42. Circular and double stranded






43. Neutralizes H2O2 - found in lysosomes






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






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






46. RNA protein-complex






47. Can serve as a primer


48. 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.






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






50. Irreversible reaction that require ATP first part of glycolosis