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






2. Triglycerides - cholesterols - and phospholipids






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






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






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






6. Phe - Trp - Tyr - Gly - Pro






7. Enzymes in Krebs cycle that produce NADH






8. Only one carbon center is changed






9. RNA protein-complex






10. Krebs cycle enzyme






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






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






13. 1e-14






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






15. Val - Leu - Ile - Ala - Met






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






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






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






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






20. Cleaves on C terminal side of lysine and arginine






21. Do not contain F factor






22. Neutralizes H2O2 - found in lysosomes






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






24. Enter cells freely






25. Repeated replication w/o cell division






26. Actin - myosin - and other muscle proteins






27. Operon 1/2 - gene 1/6






28. Vitamin B1 - cofactor that aids in dehydrogenase mostly






29. 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.






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






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






32. Ser - Cys - Thr - Gln - Asn






33. 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






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






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






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






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






38. Measures physical base pair distance






39. 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.






40. 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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41. Failure of chromosome pairs to separate during meiosis






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






43. 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 -






44. Circular and double stranded






45. FAD-2 - NADP-3






46. Gene has multiple effects






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






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






49. MRNA






50. Irreversible reaction that require ATP first part of glycolosis