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






3. Only one carbon center is changed






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






5. 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 -






6. PKa = pH






7. Makes Acetyl-CoA from pyruvate






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






9. Can undergo both lytic and lysogenic cycle






10. Gene has multiple effects






11. Val - Leu - Ile - Ala - Met






12. Triglycerides - cholesterols - and phospholipids






13. Enter cells freely






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






15. Do not contain F factor






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






17. Cleaves on C terminal side of lysine and arginine






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






19. FAD-2 - NADP-3






20. Phe - Trp - Tyr - Gly - Pro






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






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






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






24. Actin - myosin - and other muscle proteins






25. 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.






26. Can serve as a primer






27. Irreversible reaction that require ATP first part of glycolosis






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






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






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






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






32. Vitamin B1 - cofactor that aids in dehydrogenase mostly






33. Repeated replication w/o cell division






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






35. RNA protein-complex






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






37. Enzymes in Krebs cycle that produce NADH






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. Krebs cycle enzyme






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






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






42. MRNA






43. Failure of chromosome pairs to separate during meiosis






44. 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






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






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






47. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.






48. Derived from golgi vesicles






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






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