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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. Enter cells freely

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

3. Gene duplication

4. 1e-14

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

6. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.

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

8. 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

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

10. Actin - myosin - and other muscle proteins

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

12. Derived from golgi vesicles

13. MRNA

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

15. Operon 1/2 - gene 1/6

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

17. Isoelectric point and MW

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

19. PKa = pH

20. 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

21. Ser - Cys - Thr - Gln - Asn

22. Vitamin B1 - cofactor that aids in dehydrogenase mostly

23. 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.

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

25. Only one carbon center is changed

26. Cleaves on C terminal side of lysine and arginine

27. Measures physical base pair distance

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

29. 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

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

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

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

33. Failure of chromosome pairs to separate during meiosis

34. Makes Acetyl-CoA from pyruvate

35. Can serve as a primer

36. Circular and double stranded

37. Enzymes in Krebs cycle that produce NADH

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

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

40. Triglycerides - cholesterols - and phospholipids

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

42. RNA protein-complex

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

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

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

46. Gene has multiple effects

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

48. Neutralizes H2O2 - found in lysosomes

49. Irreversible reaction that require ATP first part of glycolosis

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