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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. Ser - Cys - Thr - Gln - Asn






2. Operon 1/2 - gene 1/6






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






4. 1e-14






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






6. Vitamin B1 - cofactor that aids in dehydrogenase mostly






7. Enter cells freely






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






9. Failure of chromosome pairs to separate during meiosis






10. Gene duplication






11. Phe - Trp - Tyr - Gly - Pro






12. 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 -






13. Can undergo both lytic and lysogenic cycle






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






15. 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






16. Do not contain F factor






17. 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






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






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






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






21. RNA protein-complex






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






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






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






25. Actin - myosin - and other muscle proteins






26. Irreversible reaction that require ATP first part of glycolosis






27. FAD-2 - NADP-3






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






29. Neutralizes H2O2 - found in lysosomes






30. 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.






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






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






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






34. MRNA






35. Cleaves on C terminal side of lysine and arginine






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






37. Measures physical base pair distance






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






40. 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.






41. Only one carbon center is changed






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






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






44. Gene has multiple effects






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






46. Derived from golgi vesicles






47. 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






48. Circular and double stranded






49. Enzymes in Krebs cycle that produce NADH






50. Makes Acetyl-CoA from pyruvate