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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. Measures physical base pair distance






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






4. RNA protein-complex






5. Do not contain F factor






6. 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.






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






8. 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






9. Can serve as a primer


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






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






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






13. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






14. Repeated replication w/o cell division






15. 1e-14






16. Failure of chromosome pairs to separate during meiosis






17. FAD-2 - NADP-3






18. Triglycerides - cholesterols - and phospholipids






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






20. Krebs cycle enzyme






21. Val - Leu - Ile - Ala - Met






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






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






24. Derived from golgi vesicles






25. Actin - myosin - and other muscle proteins






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






27. Enter cells freely






28. Phe - Trp - Tyr - Gly - Pro






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






30. Isoelectric point and MW






31. PKa = pH






32. Only one carbon center is changed






33. MRNA






34. Cleaves on C terminal side of lysine and arginine






35. 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






36. Operon 1/2 - gene 1/6






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






38. Irreversible reaction that require ATP first part of glycolosis






39. Enzymes in Krebs cycle that produce NADH






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






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






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






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






44. Gene duplication






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






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






47. 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.






48. 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 -






49. Gene has multiple effects






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