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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. Neutralizes H2O2 - found in lysosomes






2. Actin - myosin - and other muscle proteins






3. Enter cells freely






4. 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






5. 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.






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






7. Gene duplication






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






9. FAD-2 - NADP-3






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






11. Failure of chromosome pairs to separate during meiosis






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






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






14. Vitamin B1 - cofactor that aids in dehydrogenase mostly






15. Only one carbon center is changed






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






17. Measures physical base pair distance






18. Repeated replication w/o cell division






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






20. Circular and double stranded






21. Operon 1/2 - gene 1/6






22. 1e-14






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






24. 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






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






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






27. Isoelectric point and MW






28. Ser - Cys - Thr - Gln - Asn






29. Triglycerides - cholesterols - and phospholipids






30. Gene has multiple effects






31. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






32. Do not contain F factor






33. 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.






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






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






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






40. RNA protein-complex






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






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






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






44. Can undergo both lytic and lysogenic cycle






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






46. PKa = pH






47. Phe - Trp - Tyr - Gly - Pro






48. Val - Leu - Ile - Ala - Met






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






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







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