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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. Measures physical base pair distance






2. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






4. Phe - Trp - Tyr - Gly - Pro






5. Ser - Cys - Thr - Gln - Asn






6. 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






7. MRNA






8. Actin - myosin - and other muscle proteins






9. Irreversible reaction that require ATP first part of glycolosis






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






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






12. Can undergo both lytic and lysogenic cycle






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






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






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






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






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






19. 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






20. Repeated replication w/o cell division






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






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






23. Val - Leu - Ile - Ala - Met






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






25. 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






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






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






28. Triglycerides - cholesterols - and phospholipids






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






30. Gene has multiple effects






31. 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 -






32. 1e-14






33. Failure of chromosome pairs to separate during meiosis






34. FAD-2 - NADP-3






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






36. 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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37. Makes Acetyl-CoA from pyruvate






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






39. Derived from golgi vesicles






40. Circular and double stranded






41. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






43. 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.






44. Krebs cycle enzyme






45. Cleaves on C terminal side of lysine and arginine






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






47. Isoelectric point and MW






48. Only one carbon center is changed






49. 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.






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