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






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






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






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






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






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






7. 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






8. Circular and double stranded






9. Enter cells freely






10. Operon 1/2 - gene 1/6






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






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






13. Makes Acetyl-CoA from pyruvate






14. 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 -






15. Actin - myosin - and other muscle proteins






16. MRNA






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






18. 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






19. Gene has multiple effects






20. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






22. Can undergo both lytic and lysogenic cycle






23. 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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24. Ser - Cys - Thr - Gln - Asn






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






26. Cleaves on C terminal side of lysine and arginine






27. RNA protein-complex






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






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






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. 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.






32. 1e-14






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






34. Irreversible reaction that require ATP first part of glycolosis






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






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






37. Failure of chromosome pairs to separate during meiosis






38. Measures physical base pair distance






39. Repeated replication w/o cell division






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






41. Only one carbon center is changed






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






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






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. Krebs cycle enzyme






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






47. Derived from golgi vesicles






48. Neutralizes H2O2 - found in lysosomes






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






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