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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. Neutralizes H2O2 - found in lysosomes






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






3. FAD-2 - NADP-3






4. 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.






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






6. Triglycerides - cholesterols - and phospholipids






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






8. Vitamin B1 - cofactor that aids in dehydrogenase mostly






9. Can undergo both lytic and lysogenic cycle






10. Val - Leu - Ile - Ala - Met






11. 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






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






13. Measures physical base pair distance






14. 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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15. Enter cells freely






16. 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 -






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






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






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






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






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






22. Phe - Trp - Tyr - Gly - Pro






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






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






25. Cleaves on C terminal side of lysine and arginine






26. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






28. 1e-14






29. Makes Acetyl-CoA from pyruvate






30. 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.






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






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






33. PKa = pH






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






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






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






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






39. Failure of chromosome pairs to separate during meiosis






40. Gene duplication






41. 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.






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






43. Can serve as a primer

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44. Operon 1/2 - gene 1/6






45. Do not contain F factor






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






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






48. Irreversible reaction that require ATP first part of glycolosis






49. Circular and double stranded






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