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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. Failure of chromosome pairs to separate during meiosis






2. Gene has multiple effects






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






4. 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 -






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






6. Circular and double stranded






7. Enter cells freely






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






9. FAD-2 - NADP-3






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






11. 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






12. 1e-14






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






14. Isoelectric point and MW






15. Can undergo both lytic and lysogenic cycle






16. Enzymes in Krebs cycle that produce NADH






17. Triglycerides - cholesterols - and phospholipids






18. Ser - Cys - Thr - Gln - Asn






19. Makes Acetyl-CoA from pyruvate






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






21. Val - Leu - Ile - Ala - Met






22. Vitamin B1 - cofactor that aids in dehydrogenase mostly






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






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






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






26. 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






27. Can serve as a primer

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28. Cleaves on C terminal side of lysine and arginine






29. 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.






30. Phe - Trp - Tyr - Gly - Pro






31. Operon 1/2 - gene 1/6






32. Gene duplication






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






34. Repeated replication w/o cell division






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






36. Measures physical base pair distance






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






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






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






40. 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






41. PKa = pH






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






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






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






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






47. 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






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






49. RNA protein-complex






50. Actin - myosin - and other muscle proteins