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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. 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
Signal recognition particle (SRP)
EF-G
catalase
Pyridoxal-phosphate (PLP)
2. Serine protease that cleaves on c terminal side of aromatics
chymotrypsin
3' terminal -OH
FAD and NADP ATP equivalents
isocitrate dehydrogenase and a-ketogluterase
3. Non-protein chemical compound that is bound to a protein and is required for the protein'S biological activity
Polar AAs
PFK2
SOS repair
cofactors
4. Neutralizes H2O2 - found in lysosomes
mtDNA and chDNA
pyruvate dehydrogenase
catalase
Polar AAs
5. (His - Arg - Lys +) - (Glu - Asp -)
Charged AAs
microtubules
kb
origin of multi gene families
6. Vitamin B7 - cofactor that aids in CO2 transfer (carboxylase)
biotin
Acetyl-CoA carboxylase
phosphatase
PEP carboxylase
7. An enzyme that removes a phosphate group from its substrate
phosphatase
catalase
nondisjunction
Pyruvate carboxylase
8. Enzymes in Krebs cycle that produce NADH
biotin
isocitrate dehydrogenase and a-ketogluterase
Charged AAs
F' (F-prime) bacteria
9. Acetyl-CoA to malonyl-CoA - rate limiting step in fatty acid synthesis
kb
[B]=[A] - ratio = 1
Acetyl-CoA carboxylase
FAD and NADP ATP equivalents
10. Measure tendency for recombination (frequency) 1cM = 1% chance of being separated
phosphorolysis
catalase
centimorgans
cis and trans golgi network
11. Can undergo both lytic and lysogenic cycle
isocitrate dehydrogenase and a-ketogluterase
Non Polar AAs
[B]=[A] - ratio = 1
temperate bacteriophage
12. Tightly packed form of DNA - less accessible to protein factors that usually bind DNA
F' (F-prime) bacteria
mtDNA and chDNA
Acetyl-CoA carboxylase
heterochromatin
13. Gene duplication
origin of multi gene families
cis and trans golgi network
chymotrypsin
SOS repair
14. Donates electrons to form a bond such as N in amines and O in alcohols
euchromatin
PEP carboxylase
nucleophile
Polytene chromosome
15. Can result in allele differences - suce as 3:1 and 1:3
gene conversion
biotin
nucleophile
F- bacteria
16. Operon 1/2 - gene 1/6
Acetyl-CoA carboxylase
isocitrate dehydrogenase and a-ketogluterase
Hfr bacteria
chance of in frame fusion for operon? and gene?
17. Makes Acetyl-CoA from pyruvate
pyruvate dehydrogenase
Pyridoxal-phosphate (PLP)
tyrosine kinase
nucleophile
18. Triglycerides - cholesterols - and phospholipids
VLDL
2D gel electrophoresis
2 -4 DNP
biotin
19. Val - Leu - Ile - Ala - Met
isocitrate dehydrogenase and a-ketogluterase
Non Polar AAs
intermediate filiments
PEP carboxylase
20. 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 -
heterochromatin
northern blot
pH
kinase
21. PKa = pH
[B]=[A] - ratio = 1
nucleophile
EF-G
PEP carboxylase
22. Unwound - participates in the active transcription of DNA to mRNA products - site of RNA Pol II regulation
pleiotropic
epinephrine
euchromatin
nondisjunction
23. Krebs cycle enzyme
chance of in frame fusion for operon? and gene?
alternative splicing
aconitase
nondisjunction
24. Can serve as a primer
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25. = pKa+ log(B/A) - -log(Ka)
Steroid Hormones
pH
cell plate
gene conversion
26. Measures physical base pair distance
mitochondria
kb
Polar AAs
epimers
27. Catalyzes the transport of tRNA and mRNA down the ribosome in prokaryotes
3' terminal -OH
EF-G
origin of multi gene families
[B]=[A] - ratio = 1
28. Cis faces the ER and trans faces the plasma membrane
Aromatic/Achiral AAs
Hfr bacteria
phosphatase
cis and trans golgi network
29. Actin - myosin - and other muscle proteins
microfiliments
PFK1
pyruvate dehydrogenase
epinephrine
30. When exons are arranged in multiple orders after removal of introns
centimorgans
origin of multi gene families
2D gel electrophoresis
alternative splicing
31. Recruits RecA protein - inhibited by LexA - results in mutagenesis
kinase
nucleophile
eEF-1 and eEF-2
SOS repair
32. Phe - Trp - Tyr - Gly - Pro
[A][B]
Aromatic/Achiral AAs
PEP carboxylase
Signal recognition particle (SRP)
33. 1e-14
Acetyl-CoA carboxylase
[A][B]
gene conversion
Polar AAs
34. Dynins and kinesins (movement) - cilia and flagella
[B]=[A] - ratio = 1
microtubules
phosphorolysis
cAMP
35. FAD-2 - NADP-3
EF-G
FAD and NADP ATP equivalents
SOS repair
trypsin
36. MRNA
F' (F-prime) bacteria
northern blot
Aromatic/Achiral AAs
PFK1
37. 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.
isocitrate dehydrogenase and a-ketogluterase
mitochondria
phosphorolysis
[A][B]
38. Gene has multiple effects
pleiotropic
Hexokinase and PFK1
Signal recognition particle (SRP)
SOS repair
39. Isoelectric point and MW
PFK1
cofactors
2D gel electrophoresis
SRP - signal recognition particle
40. Enter cells freely
pH
Steroid Hormones
temperate bacteriophage
2 -4 DNP
41. Contain their own DNA - mRNA - and proteins to synthesize more
cofactors
Non Polar AAs
[A][B]
mitochondria
42. Derived from golgi vesicles
epimers
PEP carboxykinase
PFK2
cell plate
43. 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
cis and trans golgi network
centimorgans
epinephrine
PFK1
44. Regulator of glycolysis when glucose is low by cleaving 2;6 BPG lowering PFK1 - opposite effect when glucose is high
Hfr bacteria
PFK2
centimorgans
Acetyl-CoA carboxylase
45. Recognizes and targets specific proteins to the endoplasmic reticulum in eukaryotes and the plasma membrane in prokaryotes
temperate bacteriophage
alternative splicing
Signal recognition particle (SRP)
heterochromatin
46. Catalyzes the addition of bicarbonate to phosphoenolpyruvate (PEP) to form the four-carbon compound oxaloacetate
nondisjunction
PEP carboxylase
PEP carboxykinase
biotin
47. Nuclear lamins - desmins - keratins - internexins (structure)
phosphatase
intermediate filiments
Hexokinase and PFK1
chance of in frame fusion for operon? and gene?
48. Ser - Cys - Thr - Gln - Asn
Polar AAs
Steroid Hormones
pH
trypsin
49. Cleaves on C terminal side of lysine and arginine
[B]=[A] - ratio = 1
trypsin
FAD and NADP ATP equivalents
origin of multi gene families
50. Catalyzes the transport of tRNA and mRNA down the ribosome in eukaryotes
pH
Non Polar AAs
tyrosine kinase
eEF-1 and eEF-2