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

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

3. Only one carbon center is changed

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

5. 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 -

6. PKa = pH

7. Makes Acetyl-CoA from pyruvate

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

9. Can undergo both lytic and lysogenic cycle

10. Gene has multiple effects

11. Val - Leu - Ile - Ala - Met

12. Triglycerides - cholesterols - and phospholipids

13. Enter cells freely

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

15. Do not contain F factor

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

17. Cleaves on C terminal side of lysine and arginine

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

19. FAD-2 - NADP-3

20. Phe - Trp - Tyr - Gly - Pro

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

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

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

24. Actin - myosin - and other muscle proteins

25. 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.

26. Can serve as a primer

27. Irreversible reaction that require ATP first part of glycolosis

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

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

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

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

32. Vitamin B1 - cofactor that aids in dehydrogenase mostly

33. Repeated replication w/o cell division

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

35. RNA protein-complex

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

37. Enzymes in Krebs cycle that produce NADH

38. 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

39. Krebs cycle enzyme

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

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

42. MRNA

43. Failure of chromosome pairs to separate during meiosis

44. 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

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

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

47. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.

48. Derived from golgi vesicles

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

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