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Test your basic knowledge |
GRE Biochemistry
Start Test
Study First
Subjects
:
gre
,
science
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
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. Tightly packed form of DNA - less accessible to protein factors that usually bind DNA
tyrosine kinase
Thiamine Pyrophosphate (TPP)
Hfr bacteria
heterochromatin
2. Serine protease that cleaves on c terminal side of aromatics
2D gel electrophoresis
chymotrypsin
pyruvate dehydrogenase
Signal recognition particle (SRP)
3. 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
pH
heterochromatin
Pyruvate carboxylase
PFK1
4. Vitamin B1 - cofactor that aids in dehydrogenase mostly
Steroid Hormones
northern blot
SRP - signal recognition particle
Thiamine Pyrophosphate (TPP)
5. Catalyzes the irreversible carboxylation of pyruvate to oxaloacetate (OAA).
VLDL
Pyruvate carboxylase
epinephrine
Pyridoxal-phosphate (PLP)
6. Unwound - participates in the active transcription of DNA to mRNA products - site of RNA Pol II regulation
microtubules
heterochromatin
euchromatin
cAMP
7. Catalyzes the transport of tRNA and mRNA down the ribosome in prokaryotes
temperate bacteriophage
aconitase
EF-G
heterochromatin
8. 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.
Polar AAs
epinephrine
F+ bacteria
3' terminal -OH
9. 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
cAMP
Non Polar AAs
trypsin
mitochondria
10. It uncouples oxidative phosphorylation by carrying protons across the mitochondrial membrane - leading to a rapid consumption of energy without generation of ATP.
biotin
2 -4 DNP
cAMP
alternative splicing
11. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.
heterochromatin
PEP carboxykinase
SOS repair
F' (F-prime) bacteria
12. Enter cells freely
biotin
phosphatase
nondisjunction
Steroid Hormones
13. When exons are arranged in multiple orders after removal of introns
epinephrine
PFK1
PEP carboxylase
alternative splicing
14. Failure of chromosome pairs to separate during meiosis
Aromatic/Achiral AAs
nondisjunction
pH
Steroid Hormones
15. 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.
phosphorolysis
Thiamine Pyrophosphate (TPP)
F' (F-prime) bacteria
Polytene chromosome
16. Non-protein chemical compound that is bound to a protein and is required for the protein'S biological activity
cofactors
PEP carboxylase
Aromatic/Achiral AAs
epimers
17. RNA protein-complex
Acetyl-CoA carboxylase
cAMP
SRP - signal recognition particle
origin of multi gene families
18. 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
Pyridoxal-phosphate (PLP)
kinase
nondisjunction
pH
19. MRNA
mitochondria
northern blot
euchromatin
PFK1
20. Actin - myosin - and other muscle proteins
microtubules
cis and trans golgi network
epinephrine
microfiliments
21. Recruits RecA protein - inhibited by LexA - results in mutagenesis
SOS repair
temperate bacteriophage
Non Polar AAs
phosphorolysis
22. Donates electrons to form a bond such as N in amines and O in alcohols
SRP - signal recognition particle
nucleophile
2D gel electrophoresis
alternative splicing
23. Enzymes in Krebs cycle that produce NADH
Aromatic/Achiral AAs
Pyridoxal-phosphate (PLP)
isocitrate dehydrogenase and a-ketogluterase
F+ bacteria
24. 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
mitochondria
epinephrine
2D gel electrophoresis
Signal recognition particle (SRP)
25. Do not contain F factor
Aromatic/Achiral AAs
phosphatase
F- bacteria
northern blot
26. Regulator of glycolysis when glucose is low by cleaving 2;6 BPG lowering PFK1 - opposite effect when glucose is high
PEP carboxylase
PFK2
3' terminal -OH
2 -4 DNP
27. (His - Arg - Lys +) - (Glu - Asp -)
Charged AAs
PFK2
isocitrate dehydrogenase and a-ketogluterase
Hexokinase and PFK1
28. Makes Acetyl-CoA from pyruvate
pyruvate dehydrogenase
3' terminal -OH
biotin
epimers
29. Triglycerides - cholesterols - and phospholipids
VLDL
Thiamine Pyrophosphate (TPP)
SOS repair
temperate bacteriophage
30. Repeated replication w/o cell division
kb
Polytene chromosome
temperate bacteriophage
SRP - signal recognition particle
31. Gene duplication
Steroid Hormones
SOS repair
alternative splicing
origin of multi gene families
32. Val - Leu - Ile - Ala - Met
biotin
SOS repair
PEP carboxylase
Non Polar AAs
33. Measure tendency for recombination (frequency) 1cM = 1% chance of being separated
epinephrine
catalase
Steroid Hormones
centimorgans
34. Dynins and kinesins (movement) - cilia and flagella
microtubules
nondisjunction
Hfr bacteria
heterochromatin
35. Only one carbon center is changed
microtubules
epimers
temperate bacteriophage
cAMP
36. Acetyl-CoA to malonyl-CoA - rate limiting step in fatty acid synthesis
tyrosine kinase
Aromatic/Achiral AAs
centimorgans
Acetyl-CoA carboxylase
37. Irreversible reaction that require ATP first part of glycolosis
PEP carboxylase
FAD and NADP ATP equivalents
Hexokinase and PFK1
isocitrate dehydrogenase and a-ketogluterase
38. Gene has multiple effects
pleiotropic
Non Polar AAs
2D gel electrophoresis
chance of in frame fusion for operon? and gene?
39. Ser - Cys - Thr - Gln - Asn
PEP carboxykinase
Non Polar AAs
Polar AAs
PEP carboxylase
40. Cis faces the ER and trans faces the plasma membrane
isocitrate dehydrogenase and a-ketogluterase
euchromatin
cis and trans golgi network
Polar AAs
41. Neutralizes H2O2 - found in lysosomes
alternative splicing
microfiliments
mitochondria
catalase
42. Catalyzes the addition of bicarbonate to phosphoenolpyruvate (PEP) to form the four-carbon compound oxaloacetate
PEP carboxylase
isocitrate dehydrogenase and a-ketogluterase
tyrosine kinase
microtubules
43. Phe - Trp - Tyr - Gly - Pro
microtubules
3' terminal -OH
Aromatic/Achiral AAs
PFK2
44. Circular and double stranded
aconitase
F+ bacteria
mtDNA and chDNA
pH
45. Cleaves on C terminal side of lysine and arginine
biotin
PEP carboxykinase
trypsin
VLDL
46. Catalyzes the transport of tRNA and mRNA down the ribosome in eukaryotes
cAMP
eEF-1 and eEF-2
Acetyl-CoA carboxylase
PFK1
47. Krebs cycle enzyme
mitochondria
aconitase
kinase
[A][B]
48. Nuclear lamins - desmins - keratins - internexins (structure)
Acetyl-CoA carboxylase
Aromatic/Achiral AAs
phosphorolysis
intermediate filiments
49. Measures physical base pair distance
isocitrate dehydrogenase and a-ketogluterase
pH
kb
Polytene chromosome
50. Vitamin B7 - cofactor that aids in CO2 transfer (carboxylase)
temperate bacteriophage
heterochromatin
biotin
SOS repair