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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. Circular and double stranded






2. Only one carbon center is changed






3. Makes Acetyl-CoA from pyruvate






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






5. RNA protein-complex






6. 1e-14






7. Phe - Trp - Tyr - Gly - Pro






8. MRNA






9. Do not contain F factor






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






11. Can serve as a primer

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






13. Gene duplication






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






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






16. 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






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






18. Enzymes in Krebs cycle that produce NADH






19. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






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






22. Actin - myosin - and other muscle proteins






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






24. Enter cells freely






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






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






27. 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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28. Derived from golgi vesicles






29. Irreversible reaction that require ATP first part of glycolosis






30. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






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






33. Val - Leu - Ile - Ala - Met






34. Krebs cycle enzyme






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






36. 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






37. Isoelectric point and MW






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






39. 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






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






41. Measures physical base pair distance






42. 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






43. 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.






44. Triglycerides - cholesterols - and phospholipids






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






46. Gene has multiple effects






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






48. Operon 1/2 - gene 1/6






49. Ser - Cys - Thr - Gln - Asn






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