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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. Measures physical base pair distance






2. Krebs cycle enzyme






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






4. Phe - Trp - Tyr - Gly - Pro






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






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






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






8. Do not contain F factor






9. Gene has multiple effects






10. Can serve as a primer

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






12. Triglycerides - cholesterols - and phospholipids






13. FAD-2 - NADP-3






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






15. MRNA






16. 1e-14






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






18. Isoelectric point and MW






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






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






21. 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






22. Val - Leu - Ile - Ala - Met






23. Circular and double stranded






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






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






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






27. Gene duplication






28. 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.






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






30. 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 -






31. 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






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






33. Operon 1/2 - gene 1/6






34. 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






35. Derived from golgi vesicles






36. 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.






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






38. Repeated replication w/o cell division






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






40. Enter cells freely






41. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






43. 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






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






45. Failure of chromosome pairs to separate during meiosis






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






47. Ser - Cys - Thr - Gln - Asn






48. Only one carbon center is changed






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







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