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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. 1e-14






2. Derived from golgi vesicles






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






4. Can serve as a primer

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5. Cleaves on C terminal side of lysine and arginine






6. 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 -






7. Operon 1/2 - gene 1/6






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






9. Can undergo both lytic and lysogenic cycle






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






11. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






12. Gene has multiple effects






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






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






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






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






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






18. Failure of chromosome pairs to separate during meiosis






19. 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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20. 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






21. Isoelectric point and MW






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






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






24. Triglycerides - cholesterols - and phospholipids






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






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






27. Val - Leu - Ile - Ala - Met






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






29. Enter cells freely






30. Phe - Trp - Tyr - Gly - Pro






31. Irreversible reaction that require ATP first part of glycolosis






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






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






34. Vitamin B1 - cofactor that aids in dehydrogenase mostly






35. 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.






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






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






38. 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






39. 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






40. Enzymes in Krebs cycle that produce NADH






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






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






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






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






45. RNA protein-complex






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






47. Krebs cycle enzyme






48. Only one carbon center is changed






49. 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.






50. Do not contain F factor