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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. Neutralizes H2O2 - found in lysosomes






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






3. Isoelectric point and MW






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






5. Circular and double stranded






6. Ser - Cys - Thr - Gln - Asn






7. Operon 1/2 - gene 1/6






8. Repeated replication w/o cell division






9. Vitamin B1 - cofactor that aids in dehydrogenase mostly






10. Cleaves on C terminal side of lysine and arginine






11. 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 -






12. Enzymes in Krebs cycle that produce NADH






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






14. Gene duplication






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. FAD-2 - NADP-3






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






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






19. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






20. Derived from golgi vesicles






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






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






23. Phe - Trp - Tyr - Gly - Pro






24. Makes Acetyl-CoA from pyruvate






25. 1e-14






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






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






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






29. 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






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






31. Enter cells freely






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






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






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






35. Irreversible reaction that require ATP first part of glycolosis






36. 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






37. 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.






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






39. RNA protein-complex






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






41. 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






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






43. MRNA






44. Triglycerides - cholesterols - and phospholipids






45. PKa = pH






46. Can undergo both lytic and lysogenic cycle






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






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






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






50. Measures physical base pair distance







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