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






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






3. 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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4. Failure of chromosome pairs to separate during meiosis






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






6. PKa = pH






7. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






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






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






11. Can undergo both lytic and lysogenic cycle






12. Makes Acetyl-CoA from pyruvate






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






14. Ser - Cys - Thr - Gln - Asn






15. Actin - myosin - and other muscle proteins






16. Can serve as a primer

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17. Krebs cycle enzyme






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






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






20. Enter cells freely






21. Irreversible reaction that require ATP first part of glycolosis






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






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






24. 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






25. Only one carbon center is changed






26. 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






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






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






29. MRNA






30. RNA protein-complex






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






32. 1e-14






33. FAD-2 - NADP-3






34. 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.






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






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






37. 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 -






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






39. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






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






41. Phe - Trp - Tyr - Gly - Pro






42. Val - Leu - Ile - Ala - Met






43. Repeated replication w/o cell division






44. Triglycerides - cholesterols - and phospholipids






45. Enzymes in Krebs cycle that produce NADH






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






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






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






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






50. 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