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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. Failure of chromosome pairs to separate during meiosis
PEP carboxylase
nondisjunction
PEP carboxykinase
origin of multi gene families
2. When exons are arranged in multiple orders after removal of introns
pleiotropic
mtDNA and chDNA
aconitase
alternative splicing
3. Can serve as a primer
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4. Catalyze the phosphorylation of tyrosine residues in proteins - involved in signal cascades
tyrosine kinase
FAD and NADP ATP equivalents
kinase
cAMP
5. Tightly packed form of DNA - less accessible to protein factors that usually bind DNA
pyruvate dehydrogenase
heterochromatin
chance of in frame fusion for operon? and gene?
temperate bacteriophage
6. Do not contain F factor
F- bacteria
gene conversion
temperate bacteriophage
intermediate filiments
7. Measure tendency for recombination (frequency) 1cM = 1% chance of being separated
pyruvate dehydrogenase
temperate bacteriophage
centimorgans
Hfr bacteria
8. Irreversible reaction that require ATP first part of glycolosis
Hexokinase and PFK1
PEP carboxylase
Polytene chromosome
chymotrypsin
9. Enzymes in Krebs cycle that produce NADH
nondisjunction
mtDNA and chDNA
isocitrate dehydrogenase and a-ketogluterase
pleiotropic
10. Cis faces the ER and trans faces the plasma membrane
cis and trans golgi network
Polar AAs
heterochromatin
PEP carboxylase
11. 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
cofactors
microtubules
epinephrine
heterochromatin
12. 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
SOS repair
mtDNA and chDNA
Pyridoxal-phosphate (PLP)
Thiamine Pyrophosphate (TPP)
13. Catalyzes the irreversible carboxylation of pyruvate to oxaloacetate (OAA).
VLDL
3' terminal -OH
Pyruvate carboxylase
Polar AAs
14. Regulator of glycolysis when glucose is low by cleaving 2;6 BPG lowering PFK1 - opposite effect when glucose is high
Acetyl-CoA carboxylase
nucleophile
PFK2
Pyruvate carboxylase
15. Donates electrons to form a bond such as N in amines and O in alcohols
F- bacteria
FAD and NADP ATP equivalents
[A][B]
nucleophile
16. Triglycerides - cholesterols - and phospholipids
PFK2
eEF-1 and eEF-2
VLDL
[B]=[A] - ratio = 1
17. Vitamin B7 - cofactor that aids in CO2 transfer (carboxylase)
biotin
2D gel electrophoresis
Pyruvate carboxylase
Hexokinase and PFK1
18. Gene duplication
nucleophile
chance of in frame fusion for operon? and gene?
origin of multi gene families
trypsin
19. Krebs cycle enzyme
mitochondria
pleiotropic
aconitase
alternative splicing
20. 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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21. Phe - Trp - Tyr - Gly - Pro
Aromatic/Achiral AAs
3' terminal -OH
Pyridoxal-phosphate (PLP)
F+ bacteria
22. Can undergo both lytic and lysogenic cycle
F+ bacteria
temperate bacteriophage
VLDL
Charged AAs
23. 1e-14
[A][B]
cell plate
mitochondria
pyruvate dehydrogenase
24. Catalyzes the transport of tRNA and mRNA down the ribosome in prokaryotes
EF-G
Thiamine Pyrophosphate (TPP)
2D gel electrophoresis
Polar AAs
25. = pKa+ log(B/A) - -log(Ka)
PFK1
pH
SRP - signal recognition particle
kb
26. (His - Arg - Lys +) - (Glu - Asp -)
pyruvate dehydrogenase
pH
biotin
Charged AAs
27. Recognizes and targets specific proteins to the endoplasmic reticulum in eukaryotes and the plasma membrane in prokaryotes
cAMP
Signal recognition particle (SRP)
Polytene chromosome
phosphorolysis
28. Gene has multiple effects
F+ bacteria
pleiotropic
PEP carboxylase
SOS repair
29. 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.
Thiamine Pyrophosphate (TPP)
F+ bacteria
kinase
pyruvate dehydrogenase
30. Recruits RecA protein - inhibited by LexA - results in mutagenesis
SOS repair
cofactors
[B]=[A] - ratio = 1
Pyridoxal-phosphate (PLP)
31. Val - Leu - Ile - Ala - Met
temperate bacteriophage
cAMP
Non Polar AAs
microfiliments
32. Acetyl-CoA to malonyl-CoA - rate limiting step in fatty acid synthesis
Acetyl-CoA carboxylase
epimers
mitochondria
pleiotropic
33. Actin - myosin - and other muscle proteins
SRP - signal recognition particle
microfiliments
2D gel electrophoresis
origin of multi gene families
34. Circular and double stranded
Hfr bacteria
cell plate
Acetyl-CoA carboxylase
mtDNA and chDNA
35. Catalyzes the addition of bicarbonate to phosphoenolpyruvate (PEP) to form the four-carbon compound oxaloacetate
2D gel electrophoresis
PEP carboxylase
northern blot
kb
36. Serine protease that cleaves on c terminal side of aromatics
PEP carboxykinase
cofactors
F+ bacteria
chymotrypsin
37. Derived from golgi vesicles
Pyruvate carboxylase
catalase
cell plate
PEP carboxykinase
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
phosphorolysis
PFK1
biotin
aconitase
39. Dynins and kinesins (movement) - cilia and flagella
pH
isocitrate dehydrogenase and a-ketogluterase
phosphatase
microtubules
40. Makes Acetyl-CoA from pyruvate
Polar AAs
Pyruvate carboxylase
pleiotropic
pyruvate dehydrogenase
41. 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.
Hfr bacteria
PFK1
cofactors
chance of in frame fusion for operon? and gene?
42. Operon 1/2 - gene 1/6
heterochromatin
isocitrate dehydrogenase and a-ketogluterase
pyruvate dehydrogenase
chance of in frame fusion for operon? and gene?
43. Converts oxaloacetate into phosphoenolpyruvate and carbon dioxide.
F- bacteria
PEP carboxykinase
Thiamine Pyrophosphate (TPP)
Aromatic/Achiral AAs
44. 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.
[A][B]
gene conversion
phosphorolysis
biotin
45. FAD-2 - NADP-3
FAD and NADP ATP equivalents
intermediate filiments
gene conversion
eEF-1 and eEF-2
46. Unwound - participates in the active transcription of DNA to mRNA products - site of RNA Pol II regulation
Hfr bacteria
euchromatin
phosphorolysis
cis and trans golgi network
47. MRNA
northern blot
pH
2D gel electrophoresis
eEF-1 and eEF-2
48. Catalyzes the transport of tRNA and mRNA down the ribosome in eukaryotes
[A][B]
F+ bacteria
F- bacteria
eEF-1 and eEF-2
49. Neutralizes H2O2 - found in lysosomes
catalase
Charged AAs
EF-G
cis and trans golgi network
50. Can result in allele differences - suce as 3:1 and 1:3
gene conversion
PFK2
Hfr bacteria
PEP carboxylase