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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. Phe - Trp - Tyr - Gly - Pro






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






3. Irreversible reaction that require ATP first part of glycolosis






4. Gene duplication






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






6. Enzymes in Krebs cycle that produce NADH






7. 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.






8. Val - Leu - Ile - Ala - Met






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






10. Krebs cycle enzyme






11. Repeated replication w/o cell division






12. Operon 1/2 - gene 1/6






13. Enter cells freely






14. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






16. Isoelectric point and MW






17. Can serve as a primer


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






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






20. Possess an F plasmid that also includes some DNA taken from the bacterial genome. Sometimes it is formed by incorrect excision from the chromosome


21. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






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






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






25. Measures physical base pair distance






26. MRNA






27. Derived from golgi vesicles






28. Gene has multiple effects






29. Cleaves on C terminal side of lysine and arginine






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






31. PKa = pH






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






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






34. Do not contain F factor






35. 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.






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






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. Only one carbon center is changed






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






40. 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






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






42. 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






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






44. Ser - Cys - Thr - Gln - Asn






45. Failure of chromosome pairs to separate during meiosis






46. Actin - myosin - and other muscle proteins






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






48. Triglycerides - cholesterols - and phospholipids






49. Neutralizes H2O2 - found in lysosomes






50. Can undergo both lytic and lysogenic cycle