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






2. Ser - Cys - Thr - Gln - Asn






3. FAD-2 - NADP-3






4. Isoelectric point and MW






5. Gene has multiple effects






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






7. Enter cells freely






8. Derived from golgi vesicles






9. 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






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






11. 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.






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






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






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






15. 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






16. RNA protein-complex






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






18. 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 -






19. Neutralizes H2O2 - found in lysosomes






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. Enzymes in Krebs cycle that produce NADH






22. Actin - myosin - and other muscle proteins






23. 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.






24. MRNA






25. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






27. Repeated replication w/o cell division






28. Triglycerides - cholesterols - and phospholipids






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






30. Gene duplication






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






32. Measures physical base pair distance






33. Can serve as a primer


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






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






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






37. PKa = pH






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






39. Circular and double stranded






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






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






42. Can undergo both lytic and lysogenic cycle






43. Only one carbon center is changed






44. Operon 1/2 - gene 1/6






45. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






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






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






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






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