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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. Makes Acetyl-CoA from pyruvate






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






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






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






5. Enzymes in Krebs cycle that produce NADH






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






8. PKa = pH






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






10. 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.






11. Vitamin B1 - cofactor that aids in dehydrogenase mostly






12. 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 -






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






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






15. 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






16. Gene has multiple effects






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






18. Krebs cycle enzyme






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






20. Operon 1/2 - gene 1/6






21. Repeated replication w/o cell division






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






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






24. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






25. Only one carbon center is changed






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






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






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






29. Enter cells freely






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






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






32. Cleaves on C terminal side of lysine and arginine






33. 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.






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






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






36. Do not contain F factor






37. Can serve as a primer

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38. Ser - Cys - Thr - Gln - Asn






39. Gene duplication






40. Measures physical base pair distance






41. Phe - Trp - Tyr - Gly - Pro






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






43. Derived from golgi vesicles






44. MRNA






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






46. 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






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






48. Triglycerides - cholesterols - and phospholipids






49. Isoelectric point and MW






50. Circular and double stranded