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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. 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 -






2. FAD-2 - NADP-3






3. Gene duplication






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






5. RNA protein-complex






6. Do not contain F factor






7. Operon 1/2 - gene 1/6






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






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






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






11. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






12. 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






13. Irreversible reaction that require ATP first part of glycolosis






14. 1e-14






15. Gene has multiple effects






16. Ser - Cys - Thr - Gln - Asn






17. Triglycerides - cholesterols - and phospholipids






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






19. Cleaves on C terminal side of lysine and arginine






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






21. Circular and double stranded






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






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






24. Makes Acetyl-CoA from pyruvate






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






26. Only one carbon center is changed






27. 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.






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






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






31. Measures physical base pair distance






32. Vitamin B1 - cofactor that aids in dehydrogenase mostly






33. 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






34. Neutralizes H2O2 - found in lysosomes






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






36. Krebs cycle enzyme






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






38. Enzymes in Krebs cycle that produce NADH






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






40. Val - Leu - Ile - Ala - Met






41. Enter cells freely






42. Repeated replication w/o cell division






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






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






45. PKa = pH






46. 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.






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






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






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






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