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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. Makes Acetyl-CoA from pyruvate






2. RNA protein-complex






3. Only one carbon center is changed






4. Actin - myosin - and other muscle proteins






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






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






7. Circular and double stranded






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






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






10. Enzymes in Krebs cycle that produce NADH






11. 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.






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






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






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






15. Triglycerides - cholesterols - and phospholipids






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






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






18. Val - Leu - Ile - Ala - Met






19. 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






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






21. Enter cells freely






22. 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 -






23. MRNA






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






25. Gene has multiple effects






26. 1e-14






27. Phe - Trp - Tyr - Gly - Pro






28. Repeated replication w/o cell division






29. Neutralizes H2O2 - found in lysosomes






30. Isoelectric point and MW






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






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






33. Failure of chromosome pairs to separate during meiosis






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






35. Ser - Cys - Thr - Gln - Asn






36. Krebs cycle enzyme






37. Derived from golgi vesicles






38. Operon 1/2 - gene 1/6






39. 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






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






41. Can undergo both lytic and lysogenic cycle






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. Gene duplication






44. Measures physical base pair distance






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






46. PKa = pH






47. Can serve as a primer


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






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






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