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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. Serine protease that cleaves on c terminal side of aromatics






2. Actin - myosin - and other muscle proteins






3. Can serve as a primer

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






5. 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






6. Enter cells freely






7. 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.






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






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






10. 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.






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






12. Makes Acetyl-CoA from pyruvate






13. PKa = pH






14. 1e-14






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. Failure of chromosome pairs to separate during meiosis






17. Isoelectric point and MW






18. Only one carbon center is changed






19. 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






20. 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.






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






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






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






24. 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






25. Krebs cycle enzyme






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






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






28. 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 -






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






30. Enzymes in Krebs cycle that produce NADH






31. Operon 1/2 - gene 1/6






32. Repeated replication w/o cell division






33. Phe - Trp - Tyr - Gly - Pro






34. Derived from golgi vesicles






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






36. Measures physical base pair distance






37. Triglycerides - cholesterols - and phospholipids






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






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






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

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






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






43. Do not contain F factor






44. Vitamin B1 - cofactor that aids in dehydrogenase mostly






45. MRNA






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






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






48. Gene duplication






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






50. Gene has multiple effects