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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. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.

2. 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.

3. Can undergo both lytic and lysogenic cycle

4. 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.

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

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

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

8. Failure of chromosome pairs to separate during meiosis

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

10. Do not contain F factor

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

12. Makes Acetyl-CoA from pyruvate

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

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

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

16. Enzymes in Krebs cycle that produce NADH

17. Val - Leu - Ile - Ala - Met

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

19. Ser - Cys - Thr - Gln - Asn

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

21. 1e-14

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

23. Measures physical base pair distance

24. Circular and double stranded

25. Operon 1/2 - gene 1/6

26. Actin - myosin - and other muscle proteins

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

28. PKa = pH

29. RNA protein-complex

30. MRNA

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

32. 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

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

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

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

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

37. 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 -

38. Only one carbon center is changed

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

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

41. Gene duplication

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

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

44. Vitamin B1 - cofactor that aids in dehydrogenase mostly

45. Gene has multiple effects

46. Krebs cycle enzyme

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

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

49. FAD-2 - NADP-3

50. 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