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






2. 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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3. Serine protease that cleaves on c terminal side of aromatics






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






5. Enzymes in Krebs cycle that produce NADH






6. Irreversible reaction that require ATP first part of glycolosis






7. Derived from golgi vesicles






8. Vitamin B1 - cofactor that aids in dehydrogenase mostly






9. 1e-14






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






11. RNA protein-complex






12. Val - Leu - Ile - Ala - Met






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






14. PKa = pH






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






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






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






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






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






20. Enter cells freely






21. Operon 1/2 - gene 1/6






22. Isoelectric point and MW






23. Cleaves on C terminal side of lysine and arginine






24. Measures physical base pair distance






25. Can serve as a primer

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26. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






27. Actin - myosin - and other muscle proteins






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






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






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






31. Neutralizes H2O2 - found in lysosomes






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






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. FAD-2 - NADP-3






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






36. 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






37. 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






38. Phe - Trp - Tyr - Gly - Pro






39. Gene duplication






40. 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 -






41. Only one carbon center is changed






42. 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






43. Ser - Cys - Thr - Gln - Asn






44. Circular and double stranded






45. Makes Acetyl-CoA from pyruvate






46. MRNA






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






48. Krebs cycle enzyme






49. 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






50. Repeated replication w/o cell division