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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. FAD-2 - NADP-3






2. Do not contain F factor






3. Makes Acetyl-CoA from pyruvate






4. Operon 1/2 - gene 1/6






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






6. Derived from golgi vesicles






7. Failure of chromosome pairs to separate during meiosis






8. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






9. 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.






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






11. 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






12. 1e-14






13. Gene has multiple effects






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






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






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






17. 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 -






18. Enzymes in Krebs cycle that produce NADH






19. MRNA






20. 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






21. Irreversible reaction that require ATP first part of glycolosis






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






23. 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






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






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






26. Circular and double stranded






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






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






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






30. PKa = pH






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






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






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






34. Gene duplication






35. Measures physical base pair distance






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






37. Repeated replication w/o cell division






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






39. Actin - myosin - and other muscle proteins






40. Val - Leu - Ile - Ala - Met






41. Krebs cycle enzyme






42. RNA protein-complex






43. Neutralizes H2O2 - found in lysosomes






44. 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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45. Can serve as a primer

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






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






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






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






50. Triglycerides - cholesterols - and phospholipids