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






2. RNA protein-complex






3. Can undergo both lytic and lysogenic cycle






4. Krebs cycle enzyme






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






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






7. 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






8. Gene has multiple effects






9. 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 -






10. Irreversible reaction that require ATP first part of glycolosis






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






12. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






14. 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.






15. Ser - Cys - Thr - Gln - Asn






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






17. Vitamin B1 - cofactor that aids in dehydrogenase mostly






18. 1e-14






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






20. Actin - myosin - and other muscle proteins






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






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






23. Measures physical base pair distance






24. 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.






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






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






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






28. Isoelectric point and MW






29. FAD-2 - NADP-3






30. Cleaves on C terminal side of lysine and arginine






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






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






33. Enzymes in Krebs cycle that produce NADH






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






35. 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






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






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






38. Phe - Trp - Tyr - Gly - Pro






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






40. Do not contain F factor






41. PKa = pH






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






43. Can serve as a primer






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






45. Neutralizes H2O2 - found in lysosomes






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






47. Triglycerides - cholesterols - and phospholipids






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






49. Enter cells freely






50. Gene duplication