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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. 1e-14






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






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






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






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






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






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






8. 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.






9. Derived from golgi vesicles






10. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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


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






13. MRNA






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






15. Can undergo both lytic and lysogenic cycle






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






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






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






19. Repeated replication w/o cell division






20. Circular and double stranded






21. Measures physical base pair distance






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






23. Irreversible reaction that require ATP first part of glycolosis






24. Gene has multiple effects






25. 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






26. Enter cells freely






27. Failure of chromosome pairs to separate during meiosis






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






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






30. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






31. Ser - Cys - Thr - Gln - Asn






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






33. Isoelectric point and MW






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. Actin - myosin - and other muscle proteins






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






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






38. 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






39. Phe - Trp - Tyr - Gly - Pro






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






41. Operon 1/2 - gene 1/6






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






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






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






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






46. PKa = pH






47. Gene duplication






48. Makes Acetyl-CoA from pyruvate






49. Do not contain F factor






50. Cleaves on C terminal side of lysine and arginine