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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. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






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






4. Enzymes in Krebs cycle that produce NADH






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






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






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






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






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






10. Neutralizes H2O2 - found in lysosomes






11. Actin - myosin - and other muscle proteins






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






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






14. Repeated replication w/o cell division






15. 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 -






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






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. Isoelectric point and MW






19. 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






20. Makes Acetyl-CoA from pyruvate






21. 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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22. Circular and double stranded






23. 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.






24. 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






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






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






27. Krebs cycle enzyme






28. Can undergo both lytic and lysogenic cycle






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






30. Measures physical base pair distance






31. Can serve as a primer

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






33. Derived from golgi vesicles






34. Gene duplication






35. Triglycerides - cholesterols - and phospholipids






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






37. Gene has multiple effects






38. 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






39. 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.






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






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






42. Only one carbon center is changed






43. Operon 1/2 - gene 1/6






44. Irreversible reaction that require ATP first part of glycolosis






45. Cleaves on C terminal side of lysine and arginine






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






47. Phe - Trp - Tyr - Gly - Pro






48. 1e-14






49. Ser - Cys - Thr - Gln - Asn






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