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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. Measures physical base pair distance






2. Ser - Cys - Thr - Gln - Asn






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






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






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






6. Failure of chromosome pairs to separate during meiosis






7. Enter cells freely






8. Derived from golgi vesicles






9. Operon 1/2 - gene 1/6






10. Irreversible reaction that require ATP first part of glycolosis






11. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






12. 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 -






13. Phe - Trp - Tyr - Gly - Pro






14. Repeated replication w/o cell division






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






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






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






18. MRNA






19. 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.






20. Triglycerides - cholesterols - and phospholipids






21. FAD-2 - NADP-3






22. Can serve as a primer

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23. 1e-14






24. Do not contain F factor






25. Neutralizes H2O2 - found in lysosomes






26. Enzymes in Krebs cycle that produce NADH






27. 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






28. PKa = pH






29. Actin - myosin - and other muscle proteins






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






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






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






33. 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






34. Circular and double stranded






35. 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.






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






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






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. Krebs cycle enzyme






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






41. 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






42. 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






43. RNA protein-complex






44. Makes Acetyl-CoA from pyruvate






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






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






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






48. Gene duplication






49. Only one carbon center is changed






50. Gene has multiple effects