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






2. PKa = pH






3. Neutralizes H2O2 - found in lysosomes






4. 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






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






6. Can serve as a primer

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






8. Gene duplication






9. 1e-14






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






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






12. FAD-2 - NADP-3






13. Actin - myosin - and other muscle proteins






14. Gene has multiple effects






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






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






17. Enter cells freely






18. RNA protein-complex






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






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






21. Do not contain F factor






22. Irreversible reaction that require ATP first part of glycolosis






23. Measures physical base pair distance






24. Val - Leu - Ile - Ala - Met






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






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






27. Isoelectric point and MW






28. Derived from golgi vesicles






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






30. 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.






31. Can undergo both lytic and lysogenic cycle






32. 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 -






33. Cleaves on C terminal side of lysine and arginine






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. MRNA






36. 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.






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






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






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






40. 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






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






42. Failure of chromosome pairs to separate during meiosis






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






44. Ser - Cys - Thr - Gln - Asn






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






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






47. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






49. Enzymes in Krebs cycle that produce NADH






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







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