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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. Makes Acetyl-CoA from pyruvate






2. 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.






3. Triglycerides - cholesterols - and phospholipids






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






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






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






7. 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.






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






9. Gene has multiple effects






10. Isoelectric point and MW






11. Repeated replication w/o cell division






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






13. MRNA






14. Can undergo both lytic and lysogenic cycle






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






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






17. Actin - myosin - and other muscle proteins






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






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






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






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






22. Failure of chromosome pairs to separate during meiosis






23. Phe - Trp - Tyr - Gly - Pro






24. Measures physical base pair distance






25. Krebs cycle enzyme






26. Cleaves on C terminal side of lysine and arginine






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






28. Derived from golgi vesicles






29. 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






30. 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






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






32. 1e-14






33. Irreversible reaction that require ATP first part of glycolosis






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






35. Vitamin B1 - cofactor that aids in dehydrogenase mostly






36. 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 -






37. Do not contain F factor






38. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






40. 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






41. Gene duplication






42. Circular and double stranded






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






44. FAD-2 - NADP-3






45. Enter cells freely






46. Ser - Cys - Thr - Gln - Asn






47. Only one carbon center is changed






48. Possess an F plasmid that also includes some DNA taken from the bacterial genome. Sometimes it is formed by incorrect excision from the chromosome


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






50. Can serve as a primer