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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. Ser - Cys - Thr - Gln - Asn






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






3. Circular and double stranded






4. Measures physical base pair distance






5. Do not contain F factor






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






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






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






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






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






12. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






13. 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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14. Enzymes in Krebs cycle that produce NADH






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






16. 1e-14






17. Gene duplication






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






19. Neutralizes H2O2 - found in lysosomes






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






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






22. Isoelectric point and MW






23. Phe - Trp - Tyr - Gly - Pro






24. Operon 1/2 - gene 1/6






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






26. 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






27. 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






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






29. Repeated replication w/o cell division






30. 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






31. Triglycerides - cholesterols - and phospholipids






32. RNA protein-complex






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






34. Val - Leu - Ile - Ala - Met






35. MRNA






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






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






38. PKa = pH






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






40. Can undergo both lytic and lysogenic cycle






41. Actin - myosin - and other muscle proteins






42. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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. Can serve as a primer

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45. 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






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






47. Only one carbon center is changed






48. 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.






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






50. Derived from golgi vesicles