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






2. 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






3. Irreversible reaction that require ATP first part of glycolosis






4. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






5. Ser - Cys - Thr - Gln - Asn






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






7. Can undergo both lytic and lysogenic cycle






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






9. Cleaves on C terminal side of lysine and arginine






10. Vitamin B1 - cofactor that aids in dehydrogenase mostly






11. Enter cells freely






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






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






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






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






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






17. Actin - myosin - and other muscle proteins






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






19. Isoelectric point and MW






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






21. Repeated replication w/o cell division






22. Phe - Trp - Tyr - Gly - Pro






23. 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 -






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






25. Can serve as a primer

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






27. 1e-14






28. 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






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






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






31. Operon 1/2 - gene 1/6






32. Krebs cycle enzyme






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






34. Failure of chromosome pairs to separate during meiosis






35. 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






36. Gene has multiple effects






37. 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






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






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






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. Dynins and kinesins (movement) - cilia and flagella






43. Circular and double stranded






44. FAD-2 - NADP-3






45. Triglycerides - cholesterols - and phospholipids






46. Measures physical base pair distance






47. Gene duplication






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






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







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