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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 irreversible carboxylation of pyruvate to oxaloacetate (OAA).






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






3. Can undergo both lytic and lysogenic cycle






4. Only one carbon center is changed






5. Val - Leu - Ile - Ala - Met






6. Failure of chromosome pairs to separate during meiosis






7. Repeated replication w/o cell division






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






9. Measures physical base pair distance






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






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






12. 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.






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






14. Operon 1/2 - gene 1/6






15. Enzymes in Krebs cycle that produce NADH






16. RNA protein-complex






17. 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






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






19. FAD-2 - NADP-3






20. Gene has multiple effects






21. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






22. Isoelectric point and MW






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






24. 1e-14






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






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






27. Gene duplication






28. Do not contain F factor






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






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






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






32. 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.






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






34. Krebs cycle enzyme






35. Derived from golgi vesicles






36. Enter cells freely






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






38. Actin - myosin - and other muscle proteins






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






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. PKa = pH






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






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






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






45. Ser - Cys - Thr - Gln - Asn






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






47. 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






48. Neutralizes H2O2 - found in lysosomes






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






50. Cleaves on C terminal side of lysine and arginine







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