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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. Enter cells freely






2. Failure of chromosome pairs to separate during meiosis






3. 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.






4. Neutralizes H2O2 - found in lysosomes






5. 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.






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






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






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






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






11. 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.






12. 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






13. Do not contain F factor






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






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






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






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






18. Circular and double stranded






19. Actin - myosin - and other muscle proteins






20. Operon 1/2 - gene 1/6






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






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






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






24. Makes Acetyl-CoA from pyruvate






25. Can serve as a primer

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26. Can undergo both lytic and lysogenic cycle






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






28. FAD-2 - NADP-3






29. Krebs cycle enzyme






30. 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






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






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






33. Val - Leu - Ile - Ala - Met






34. 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 -






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






36. PKa = pH






37. Only one carbon center is changed






38. 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






39. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






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






42. Gene duplication






43. MRNA






44. 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






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






46. Isoelectric point and MW






47. Triglycerides - cholesterols - and phospholipids






48. Cleaves on C terminal side of lysine and arginine






49. Irreversible reaction that require ATP first part of glycolosis






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