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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. Serine protease that cleaves on c terminal side of aromatics

2. Neutralizes H2O2 - found in lysosomes

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

4. Cleaves on C terminal side of lysine and arginine

5. Only one carbon center is changed

6. Irreversible reaction that require ATP first part of glycolosis

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

8. Ser - Cys - Thr - Gln - Asn

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

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

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

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

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

14. 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 -

15. Gene duplication

16. 1e-14

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

18. 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.

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

20. Krebs cycle enzyme

21. Val - Leu - Ile - Ala - Met

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

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

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

25. MRNA

26. Enzymes in Krebs cycle that produce NADH

27. FAD-2 - NADP-3

28. RNA protein-complex

29. Gene has multiple effects

30. Repeated replication w/o cell division

31. Measures physical base pair distance

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

33. 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

34. Operon 1/2 - gene 1/6

35. PKa = pH

36. Can serve as a primer

37. 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.

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

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

40. 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

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

42. Preferable to hydrolysis (like in the breakdown of glycogen or starch - as in the example above) because glucose 1-phosphate yields more ATP than does free glucose when subsequently catabolized to pyruvate.

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

44. Enter cells freely

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

46. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.

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

48. Triglycerides - cholesterols - and phospholipids

49. 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

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