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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. Enter cells freely






2. Repeated replication w/o cell division






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






4. 1e-14






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






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






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






8. 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 -






9. Val - Leu - Ile - Ala - Met






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






11. Isoelectric point and MW






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






13. Irreversible reaction that require ATP first part of glycolosis






14. 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






15. Measures physical base pair distance






16. 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






17. 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






18. Gene duplication






19. RNA protein-complex






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






21. Actin - myosin - and other muscle proteins






22. Can undergo both lytic and lysogenic cycle






23. Only one carbon center is changed






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






25. 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.






26. Derived from golgi vesicles






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






28. Failure of chromosome pairs to separate during meiosis






29. Circular and double stranded






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






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






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






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






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






35. Triglycerides - cholesterols - and phospholipids






36. 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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37. Enzymes in Krebs cycle that produce NADH






38. Do not contain F factor






39. 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.






40. Can serve as a primer

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41. 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






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






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






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






45. FAD-2 - NADP-3






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






47. Gene has multiple effects






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






49. Cleaves on C terminal side of lysine and arginine






50. Vitamin B1 - cofactor that aids in dehydrogenase mostly