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






2. 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






3. Enzymes in Krebs cycle that produce NADH






4. Repeated replication w/o cell division






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






6. Actin - myosin - and other muscle proteins






7. RNA protein-complex






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






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






10. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






11. Possess an F plasmid that also includes some DNA taken from the bacterial genome. Sometimes it is formed by incorrect excision from the chromosome


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






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






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






15. Triglycerides - cholesterols - and phospholipids






16. Operon 1/2 - gene 1/6






17. Gene has multiple effects






18. Circular and double stranded






19. Derived from golgi vesicles






20. PKa = pH






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






22. MRNA






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






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






25. 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.






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






27. 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






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






29. Can serve as a primer


30. Isoelectric point and MW






31. 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.






32. Irreversible reaction that require ATP first part of glycolosis






33. Measures physical base pair distance






34. Vitamin B1 - cofactor that aids in dehydrogenase mostly






35. Can undergo both lytic and lysogenic cycle






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






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






38. 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.






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






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






41. 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






42. Gene duplication






43. FAD-2 - NADP-3






44. 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






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






46. Ser - Cys - Thr - Gln - Asn






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






48. Enter cells freely






49. 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 -






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