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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. 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 -






2. Val - Leu - Ile - Ala - Met






3. Can undergo both lytic and lysogenic cycle






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






5. Gene duplication






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






7. MRNA






8. Phe - Trp - Tyr - Gly - Pro






9. 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






10. Enter cells freely






11. Triglycerides - cholesterols - and phospholipids






12. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






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






15. 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






16. FAD-2 - NADP-3






17. Gene has multiple effects






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






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. Enzymes in Krebs cycle that produce NADH






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






22. Isoelectric point and MW






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






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






25. RNA protein-complex






26. Derived from golgi vesicles






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






28. Failure of chromosome pairs to separate during meiosis






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






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






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






32. Circular and double stranded






33. Measures physical base pair distance






34. 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.






35. Ser - Cys - Thr - Gln - Asn






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






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






38. Only one carbon center is changed






39. Do not contain F factor






40. 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






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






42. Makes Acetyl-CoA from pyruvate






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






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






45. Can serve as a primer


46. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






47. Cleaves on C terminal side of lysine and arginine






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






49. Neutralizes H2O2 - found in lysosomes






50. 1e-14