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GRE Biochemistry

Subjects : gre, science
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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. Possess an F plasmid that also includes some DNA taken from the bacterial genome. Sometimes it is formed by incorrect excision from the chromosome

2. Makes Acetyl-CoA from pyruvate

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

4. FAD-2 - NADP-3

5. 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

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

7. Can undergo both lytic and lysogenic cycle

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

9. Circular and double stranded

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

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

12. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.

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

14. Only one carbon center is changed

15. Derived from golgi vesicles

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

17. 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.

18. RNA protein-complex

19. Phe - Trp - Tyr - Gly - Pro

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

21. Ser - Cys - Thr - Gln - Asn

22. 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.

23. PKa = pH

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

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

26. Operon 1/2 - gene 1/6

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

28. Failure of chromosome pairs to separate during meiosis

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

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

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

32. Irreversible reaction that require ATP first part of glycolosis

33. Neutralizes H2O2 - found in lysosomes

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

35. Actin - myosin - and other muscle proteins

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

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

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

39. 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

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

41. Isoelectric point and MW

42. Enzymes in Krebs cycle that produce NADH

43. Krebs cycle enzyme

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

45. Gene has multiple effects

46. Enter cells freely

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

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

49. Val - Leu - Ile - Ala - Met

50. Measures physical base pair distance