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






2. Operon 1/2 - gene 1/6






3. Val - Leu - Ile - Ala - Met






4. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






5. Ser - Cys - Thr - Gln - Asn






6. Enzymes in Krebs cycle that produce NADH






7. Can undergo both lytic and lysogenic cycle






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






9. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






11. Neutralizes H2O2 - found in lysosomes






12. Enter cells freely






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






14. Irreversible reaction that require ATP first part of glycolosis






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






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






17. MRNA






18. Isoelectric point and MW






19. Makes Acetyl-CoA from pyruvate






20. RNA protein-complex






21. 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






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






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






24. Measure tendency for recombination (frequency) 1cM = 1% chance of being separated






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






26. Krebs cycle enzyme






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






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






30. 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 -






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






32. Gene has multiple effects






33. 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.






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






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 duplication






37. Failure of chromosome pairs to separate during meiosis






38. Repeated replication w/o cell division






39. Measures physical base pair distance






40. Do not contain F factor






41. Cleaves on C terminal side of lysine and arginine






42. Actin - myosin - and other muscle proteins






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






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






45. PKa = pH






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






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






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






49. 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






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