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






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






3. 1e-14






4. Cleaves on C terminal side of lysine and arginine






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






6. 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 -






7. Can undergo both lytic and lysogenic cycle






8. Isoelectric point and MW






9. RNA protein-complex






10. Gene duplication






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






12. Actin - myosin - and other muscle proteins






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






14. Circular and double stranded






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






16. 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.






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






18. Operon 1/2 - gene 1/6






19. 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.






20. 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






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. An enzyme that removes a phosphate group from its substrate






23. Only one carbon center is changed






24. Failure of chromosome pairs to separate during meiosis






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






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






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






28. Val - Leu - Ile - Ala - Met






29. Enter cells freely






30. Krebs cycle enzyme






31. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






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






34. 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






35. MRNA






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






37. 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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38. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






39. Neutralizes H2O2 - found in lysosomes






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






41. PKa = pH






42. Enzymes in Krebs cycle that produce NADH






43. Measures physical base pair distance






44. Gene has multiple effects






45. FAD-2 - NADP-3






46. Ser - Cys - Thr - Gln - Asn






47. 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.






48. Phe - Trp - Tyr - Gly - Pro






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






50. Do not contain F factor