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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. Vitamin B1 - cofactor that aids in dehydrogenase mostly






2. 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 -






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






4. 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






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






6. RNA protein-complex






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






8. Actin - myosin - and other muscle proteins






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






10. 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






11. Circular and double stranded






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






13. Isoelectric point and MW






14. Ser - Cys - Thr - Gln - Asn






15. FAD-2 - NADP-3






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






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






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






19. Gene has multiple effects






20. Repeated replication w/o cell division






21. Can undergo both lytic and lysogenic cycle






22. Val - Leu - Ile - Ala - Met






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






24. MRNA






25. 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






26. Enzymes in Krebs cycle that produce NADH






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






28. Measures physical base pair distance






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






30. 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.






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






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






33. Neutralizes H2O2 - found in lysosomes






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






35. Operon 1/2 - gene 1/6






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






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






38. Derived from golgi vesicles






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






40. Do not contain F factor






41. 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.






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






43. Irreversible reaction that require ATP first part of glycolosis






44. Makes Acetyl-CoA from pyruvate






45. 1e-14






46. Only one carbon center is changed






47. 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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48. Phe - Trp - Tyr - Gly - Pro






49. Can serve as a primer

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







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