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






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






3. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






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






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






7. 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 -






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






9. 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.






10. Do not contain F factor






11. Ser - Cys - Thr - Gln - Asn






12. 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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13. Dynins and kinesins (movement) - cilia and flagella






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






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






16. Measures physical base pair distance






17. Failure of chromosome pairs to separate during meiosis






18. 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.






19. Gene has multiple effects






20. Isoelectric point and MW






21. Neutralizes H2O2 - found in lysosomes






22. 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.






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






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






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






26. FAD-2 - NADP-3






27. 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






28. Gene duplication






29. Can serve as a primer

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30. Makes Acetyl-CoA from pyruvate






31. Actin - myosin - and other muscle proteins






32. 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






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






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






35. Only one carbon center is changed






36. Triglycerides - cholesterols - and phospholipids






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






38. Operon 1/2 - gene 1/6






39. RNA protein-complex






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






41. Enzymes in Krebs cycle that produce NADH






42. Irreversible reaction that require ATP first part of glycolosis






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






44. Repeated replication w/o cell division






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






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






47. Phe - Trp - Tyr - Gly - Pro






48. PKa = pH






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






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