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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. Phe - Trp - Tyr - Gly - Pro

2. Val - Leu - Ile - Ala - Met

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

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

5. PKa = pH

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

7. 1e-14

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

9. Vitamin B1 - cofactor that aids in dehydrogenase mostly

10. Can serve as a primer

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

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

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

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

15. Measures physical base pair distance

16. Repeated replication w/o cell division

17. 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.

18. FAD-2 - NADP-3

19. MRNA

20. Triglycerides - cholesterols - and phospholipids

21. Possess an F plasmid that also includes some DNA taken from the bacterial genome. Sometimes it is formed by incorrect excision from the chromosome

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

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

24. Circular and double stranded

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

26. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.

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

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

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

30. Operon 1/2 - gene 1/6

31. Gene duplication

32. Neutralizes H2O2 - found in lysosomes

33. Irreversible reaction that require ATP first part of glycolosis

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

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

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

37. Only one carbon center is changed

38. Do not contain F factor

39. 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

40. Derived from golgi vesicles

41. 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

42. 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.

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

44. Failure of chromosome pairs to separate during meiosis

45. Makes Acetyl-CoA from pyruvate

46. Ser - Cys - Thr - Gln - Asn

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

48. 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

49. RNA protein-complex

50. 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