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Directions. Solve the following problems. Show your solutions.
I. For the voltaic cell, 2 Na(s) + Fe2+(aq) → 2 Na+
(aq) + Fe(s)
a) Write the two half-reactions.
b) Write the cell notation.
c) Calculate E ° for the cell.
II. Consider the fission reaction 1
0n + 235
92U →
89
37Rb + 3 0
-1e + 3 1
0n + 144
58Ce
How much energy in kilojoules is released per gram of Uranium- 235?
III. For Al-28, calculate the binding energy in kilojoules /mol?
IV. Sketch a portion of the acrylonitrile polymer ( Refer to Table 23.1) assuming it is a
a) head-to-tail polymer
b) head-to-tail, tail-to-tail polymer
Which of the following compounds are macroergic
A. glycerol 3-phosphate
B. Carbamoyl phosphate
C. Fructose-6-phosphate
D. Glycerol-3-phosphate
E. 1,3 - bisphosphoglycerate
F. Glucose-3-phosphate
G. Adenosine diphosphate
Transport RNA is defined as an "adapter" molecule in protein biosynthesis because (more than 1)
a. reads the amino acid sequence to guide RNA synthesis
b. connects the 30S and 50S subunits of ribosomes
c. can “recognize” both aminoacyl-Trnk synthetases and amino acids
d. functions by "translating" the nucleotide sequence of the mRNA into the corresponding amino acid sequence of the synthesized protein
Which of the following statements apply to globular proteins (select one or more)
a. active center is formed at the level-secondary structure
b. regulatory centers are formed at the level of the quarterly structure
c. when the tertiary structure is disturbed, partial and complete loss of biological properties occurs
d. subunits in quaternary proteins bind to covalent bonds
e. active center is formed at the level-tertiary structure
2,3-BPG (2,3-bisphosphoglycerate) is an intermediate in the reaction catalyzed by phosphoglycerate mutase. Erythrocytes need minimal amounts of 2,3-BPG because: (select one or more)
a. involved in the conversion of 3-phosphoglycerate to 2-phosphoglycerate
b. involved in the formation of 1,3-bisphosphoglycerate
c. fatty acid synthase regulator
d. is a negative effect of hemoglobin function
e. ATP synthase regulator
Which of the following pairs of amino acids has a negatively charged side chain at pH 8.0? (select one)
A. asparagine and glutamine
B. leucine and glycine
C. histidine and lysine
D. aspartate and glutamate
An alcoholic in a state of hypoglycaemic coma was admitted to Pirogov. Since alcoholics usually suffer from malnutrition, Dr. Ivanov performs a biochemical test. Which of the following enzymes should you test for thiamine deficiency? (select one)
A. UDP-galactose epimerase
B. transaldolase
C. aldolase
D. glucose-6-phosphate dehydrogenase
E. transketolase
Which of the following statements about Michaelis-Menten kinetics is true provided that the substrate concentration is equal to Km: (select one or more)
A. 50% of enzyme molecules are bound to the substrate
B. the reaction rate is equal to half the Vmax
C. the reaction rate is equal to Vmax
D. the reaction rate does not depend on the substrate concentration
E. the enzyme is completely saturated with substrate
What is the role of carbohydrates in nature (select one or more)
a. they are a component in the structure of important coenzymes
b. they are conjugated to a number of proteins and lipids
c. they are an energy source for animals and plants
d. they are the main structural component of animal cells
e. they are a component of nucleic acids
Which of the following lipids is involved in signal transduction (select one)
a. phospholipase A2
b. phosphatidyl glycerol
c. phosphatidyl choline
d. phosphatidyl serine
e. plasminogen activator
f. phosphatidyl inositol 4,5-bisphosphate
#339914 on Dec 2023