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






2. Gene has multiple effects






3. Circular and double stranded






4. Makes Acetyl-CoA from pyruvate






5. RNA protein-complex






6. Triglycerides - cholesterols - and phospholipids






7. Repeated replication w/o cell division






8. 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






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






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






11. Operon 1/2 - gene 1/6






12. 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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13. 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






14. Gene duplication






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






16. Only one carbon center is changed






17. Irreversible reaction that require ATP first part of glycolosis






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






19. MRNA






20. Ser - Cys - Thr - Gln - Asn






21. 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.






22. Neutralizes H2O2 - found in lysosomes






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






24. 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 -






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






26. 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.






27. PKa = pH






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






29. Measures physical base pair distance






30. Donates electrons to form a bond such as N in amines and O in alcohols






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






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






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






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






35. Krebs cycle enzyme






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






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






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. Val - Leu - Ile - Ala - Met






40. 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






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






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






43. Phe - Trp - Tyr - Gly - Pro






44. Enter cells freely






45. FAD-2 - NADP-3






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






47. Failure of chromosome pairs to separate during meiosis






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






49. Can undergo both lytic and lysogenic cycle






50. Do not contain F factor