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






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






3. 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.






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






5. 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.






6. Neutralizes H2O2 - found in lysosomes






7. Actin - myosin - and other muscle proteins






8. PKa = pH






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






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






11. Can undergo both lytic and lysogenic cycle






12. Can serve as a primer

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13. 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.






14. Cleaves on C terminal side of lysine and arginine






15. Phe - Trp - Tyr - Gly - Pro






16. 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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17. Failure of chromosome pairs to separate during meiosis






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






19. Gene duplication






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






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






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






23. Circular and double stranded






24. Gene has multiple effects






25. Repeated replication w/o cell division






26. 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 -






27. Irreversible reaction that require ATP first part of glycolosis






28. 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






29. FAD-2 - NADP-3






30. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






31. Enzymes in Krebs cycle that produce NADH






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






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






34. Operon 1/2 - gene 1/6






35. Only one carbon center is changed






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






37. Isoelectric point and MW






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






39. 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






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






41. Makes Acetyl-CoA from pyruvate






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






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






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






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






46. Vitamin B1 - cofactor that aids in dehydrogenase mostly






47. Enter cells freely






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






49. Ser - Cys - Thr - Gln - Asn






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