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






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






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






4. FAD-2 - NADP-3






5. Vitamin B1 - cofactor that aids in dehydrogenase mostly






6. 1e-14






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






8. 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.






9. Phe - Trp - Tyr - Gly - Pro






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






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






12. Enzymes in Krebs cycle that produce NADH






13. Failure of chromosome pairs to separate during meiosis






14. Circular and double stranded






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






16. Triglycerides - cholesterols - and phospholipids






17. Krebs cycle enzyme






18. Operon 1/2 - gene 1/6






19. Repeated replication w/o cell division






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






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






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






23. Catalyzes the transport of tRNA and mRNA down the ribosome 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. 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 -






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






27. 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






28. Makes Acetyl-CoA from pyruvate






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






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






31. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






32. Neutralizes H2O2 - found in lysosomes






33. RNA protein-complex






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






35. Val - Leu - Ile - Ala - Met






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






37. 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.






38. Isoelectric point and MW






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






40. Ser - Cys - Thr - Gln - Asn






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






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






43. Can serve as a primer

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44. Gene duplication






45. 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.






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






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






48. Only one carbon center is changed






49. MRNA






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