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Test your basic knowledge |
GRE Biochemistry
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Subjects
:
gre
,
science
Instructions:
Answer 50 questions in 15 minutes.
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.
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. Ser - Cys - Thr - Gln - Asn
VLDL
Polar AAs
pyruvate dehydrogenase
epinephrine
2. (His - Arg - Lys +) - (Glu - Asp -)
aconitase
Hfr bacteria
F' (F-prime) bacteria
Charged AAs
3. Tightly packed form of DNA - less accessible to protein factors that usually bind DNA
Steroid Hormones
heterochromatin
Thiamine Pyrophosphate (TPP)
VLDL
4. Nuclear lamins - desmins - keratins - internexins (structure)
Non Polar AAs
kinase
epimers
intermediate filiments
5. Non-protein chemical compound that is bound to a protein and is required for the protein'S biological activity
nucleophile
cofactors
alternative splicing
Steroid Hormones
6. 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
cofactors
Pyridoxal-phosphate (PLP)
Hexokinase and PFK1
cAMP
7. Recognizes and targets specific proteins to the endoplasmic reticulum in eukaryotes and the plasma membrane in prokaryotes
mtDNA and chDNA
3' terminal -OH
kinase
Signal recognition particle (SRP)
8. Regulator of glycolysis when glucose is low by cleaving 2;6 BPG lowering PFK1 - opposite effect when glucose is high
Aromatic/Achiral AAs
Steroid Hormones
Polar AAs
PFK2
9. Catalyzes the irreversible carboxylation of pyruvate to oxaloacetate (OAA).
[B]=[A] - ratio = 1
epinephrine
Pyruvate carboxylase
cofactors
10. 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 -
Polytene chromosome
F- bacteria
PEP carboxylase
kinase
11. Acetyl-CoA to malonyl-CoA - rate limiting step in fatty acid synthesis
Acetyl-CoA carboxylase
Non Polar AAs
[B]=[A] - ratio = 1
PFK2
12. 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
epinephrine
Hexokinase and PFK1
alternative splicing
PFK1
13. Val - Leu - Ile - Ala - Met
cell plate
Non Polar AAs
PFK2
PEP carboxylase
14. Can undergo both lytic and lysogenic cycle
temperate bacteriophage
pleiotropic
microtubules
2D gel electrophoresis
15. Measure tendency for recombination (frequency) 1cM = 1% chance of being separated
centimorgans
Hexokinase and PFK1
FAD and NADP ATP equivalents
kb
16. Triglycerides - cholesterols - and phospholipids
biotin
VLDL
2D gel electrophoresis
epimers
17. Can serve as a primer
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18. Serine protease that cleaves on c terminal side of aromatics
PEP carboxylase
chymotrypsin
centimorgans
temperate bacteriophage
19. Neutralizes H2O2 - found in lysosomes
kinase
catalase
Polytene chromosome
trypsin
20. FAD-2 - NADP-3
kinase
cAMP
FAD and NADP ATP equivalents
kb
21. Isoelectric point and MW
nondisjunction
FAD and NADP ATP equivalents
2D gel electrophoresis
Thiamine Pyrophosphate (TPP)
22. Gene has multiple effects
EF-G
trypsin
pleiotropic
chance of in frame fusion for operon? and gene?
23. Gene duplication
PEP carboxylase
phosphorolysis
origin of multi gene families
isocitrate dehydrogenase and a-ketogluterase
24. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.
[B]=[A] - ratio = 1
cis and trans golgi network
PEP carboxykinase
3' terminal -OH
25. When exons are arranged in multiple orders after removal of introns
alternative splicing
chance of in frame fusion for operon? and gene?
Pyruvate carboxylase
F- bacteria
26. Makes Acetyl-CoA from pyruvate
pyruvate dehydrogenase
epinephrine
pH
PFK1
27. Catalyzes the transport of tRNA and mRNA down the ribosome in prokaryotes
euchromatin
microtubules
epinephrine
EF-G
28. Can result in allele differences - suce as 3:1 and 1:3
F- bacteria
FAD and NADP ATP equivalents
gene conversion
Thiamine Pyrophosphate (TPP)
29. Catalyzes the transport of tRNA and mRNA down the ribosome in eukaryotes
Polar AAs
F- bacteria
eEF-1 and eEF-2
alternative splicing
30. 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.
phosphorolysis
Hfr bacteria
centimorgans
Hexokinase and PFK1
31. RNA protein-complex
SRP - signal recognition particle
Pyridoxal-phosphate (PLP)
SOS repair
origin of multi gene families
32. Possess an F plasmid that also includes some DNA taken from the bacterial genome. Sometimes it is formed by incorrect excision from the chromosome
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33. An enzyme that removes a phosphate group from its substrate
3' terminal -OH
phosphatase
euchromatin
temperate bacteriophage
34. Unwound - participates in the active transcription of DNA to mRNA products - site of RNA Pol II regulation
Pyridoxal-phosphate (PLP)
intermediate filiments
euchromatin
SRP - signal recognition particle
35. Do not contain F factor
temperate bacteriophage
gene conversion
F- bacteria
cell plate
36. Contain their own DNA - mRNA - and proteins to synthesize more
Signal recognition particle (SRP)
tyrosine kinase
Thiamine Pyrophosphate (TPP)
mitochondria
37. Donates electrons to form a bond such as N in amines and O in alcohols
nucleophile
EF-G
epinephrine
origin of multi gene families
38. Circular and double stranded
3' terminal -OH
mtDNA and chDNA
intermediate filiments
F' (F-prime) bacteria
39. Only one carbon center is changed
epimers
kinase
gene conversion
Steroid Hormones
40. Enter cells freely
catalase
VLDL
Steroid Hormones
epimers
41. Operon 1/2 - gene 1/6
Thiamine Pyrophosphate (TPP)
chance of in frame fusion for operon? and gene?
catalase
eEF-1 and eEF-2
42. 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
[A][B]
tyrosine kinase
phosphatase
PFK1
43. 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
[A][B]
VLDL
Pyridoxal-phosphate (PLP)
nondisjunction
44. = pKa+ log(B/A) - -log(Ka)
biotin
pH
mitochondria
PEP carboxylase
45. Derived from golgi vesicles
cell plate
Steroid Hormones
F' (F-prime) bacteria
mitochondria
46. MRNA
nondisjunction
SRP - signal recognition particle
northern blot
heterochromatin
47. Cleaves on C terminal side of lysine and arginine
temperate bacteriophage
EF-G
trypsin
catalase
48. It uncouples oxidative phosphorylation by carrying protons across the mitochondrial membrane - leading to a rapid consumption of energy without generation of ATP.
cell plate
Thiamine Pyrophosphate (TPP)
2 -4 DNP
Signal recognition particle (SRP)
49. 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.
intermediate filiments
2D gel electrophoresis
Charged AAs
phosphorolysis
50. Dynins and kinesins (movement) - cilia and flagella
intermediate filiments
Acetyl-CoA carboxylase
chance of in frame fusion for operon? and gene?
microtubules
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