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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. Dynins and kinesins (movement) - cilia and flagella






2. Irreversible reaction that require ATP first part of glycolosis






3. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






5. Phe - Trp - Tyr - Gly - Pro






6. Enzymes in Krebs cycle that produce NADH






7. Repeated replication w/o cell division






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






9. Cleaves on C terminal side of lysine and arginine






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






11. Krebs cycle enzyme






12. 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






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






14. FAD-2 - NADP-3






15. Actin - myosin - and other muscle proteins






16. Operon 1/2 - gene 1/6






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






18. Only one carbon center is changed






19. Can undergo both lytic and lysogenic cycle






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






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






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






23. PKa = pH






24. Triglycerides - cholesterols - and phospholipids






25. 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 -






26. Failure of chromosome pairs to separate during meiosis






27. 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.






28. Enter cells freely






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






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






31. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






32. 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






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






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






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






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






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






38. Circular and double stranded






39. Val - Leu - Ile - Ala - Met






40. 1e-14






41. Can serve as a primer

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






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






44. MRNA






45. 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.






46. Derived from golgi vesicles






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






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






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






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