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






2. FAD-2 - NADP-3






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






4. Can undergo both lytic and lysogenic cycle






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






6. Gene duplication






7. 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






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






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






10. 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






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






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






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






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






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






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






17. 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.






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






19. Cleaves on C terminal side of lysine and arginine






20. RNA protein-complex






21. Circular and double stranded






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






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






24. 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






25. Enzymes in Krebs cycle that produce NADH






26. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






27. Irreversible reaction that require ATP first part of glycolosis






28. MRNA






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






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






31. Do not contain F factor






32. Repeated replication w/o cell division






33. Gene has multiple effects






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






35. Makes Acetyl-CoA from pyruvate






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






37. Measures physical base pair distance






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






39. Enter cells freely






40. 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 -






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






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






43. Only one carbon center is changed






44. Phe - Trp - Tyr - Gly - Pro






45. Actin - myosin - and other muscle proteins






46. Operon 1/2 - gene 1/6






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






48. Isoelectric point and MW






49. Derived from golgi vesicles






50. Vitamin B1 - cofactor that aids in dehydrogenase mostly