8 A Which of the following statements is NOT true? Gibb\'s free energy of zero i
ID: 206881 • Letter: 8
Question
8 A Which of the following statements is NOT true?
Gibb's free energy of zero is indicative of a reaction at equilibrium.
An energetically unfavorable reaction can be made energetically favorable by coupling it with ATP hydrolysis.
The actual free energy change of a reaction is equal to the standard free energy change if the reaction occurs at 100 Kelvin, 1 atm, pH 7.0, and beginning with 1 M concentrations of reactants.
8 B Which of the following is correct?
Unsaturated fatty acids, such as oleic and linoleic acid, contain only single carbon bonds.
Cellular bilayer membranes are composed of polysaccharide molecules.
Phospholipids are composed of a hydrophilic head group, comprised of a phosphate group and glycerol, linked to various fatty acid chains.
Disulfide bonds are formed between neighboring tyrosine residues and contribute to the stability of polypeptides.
Gibb's free energy of zero is indicative of a reaction at equilibrium.
An energetically unfavorable reaction can be made energetically favorable by coupling it with ATP hydrolysis.
A reaction that results in an increase of free energy is called endergonic.The actual free energy change of a reaction is equal to the standard free energy change if the reaction occurs at 100 Kelvin, 1 atm, pH 7.0, and beginning with 1 M concentrations of reactants.
8 B Which of the following is correct?
Unsaturated fatty acids, such as oleic and linoleic acid, contain only single carbon bonds.
Cellular bilayer membranes are composed of polysaccharide molecules.
Phospholipids are composed of a hydrophilic head group, comprised of a phosphate group and glycerol, linked to various fatty acid chains.
Disulfide bonds are formed between neighboring tyrosine residues and contribute to the stability of polypeptides.
Explanation / Answer
Question: 8 A. Which of the following statements is NOT true?
Answer: False - The actual free energy change of a reaction is equal to the standard free energy change if the reaction occurs at 100 Kelvin, 1 atm, pH 7.0, and beginning with 1 M concentrations of reactants.
Free Energy and Equilibrium : G° = -R T lnK at a temperature (T) of 298 K (25oC ), 1 atm, pH 7.0, and beginning with 1 M concentrations of reactants..
True - Gibb's free energy of zero is indicative of a reaction at equilibrium.
True - An energetically unfavorable reaction can be made energetically favorable by coupling it with ATP hydrolysis.
True - A reaction that results in an increase of free energy is called endergonic.
Question: 8 B. Which of the following is correct?
Answer: Correct - Phospholipids are composed of a hydrophilic head group, comprised of a phosphate group and glycerol, linked to various fatty acid chains.
Incorrect - Unsaturated fatty acids, such as oleic and linoleic acid, contain only single carbon bonds: Unsaturated fatty acids contain one or more carbon-carbon double bonds. Saturated fatty acids contain only single bonds between carbon atoms. Oleic and linoleic acids are the most common unsaturated fatty acids. Oleic acid has only one carbon-carbon double bond and hence it is referred to as monounsaturated. Linoleic acid has two carbon-carbon double bonds and hence it is referred to a polyunsaturated.
Incorrect - Cellular bilayer membranes are composed of polysaccharide molecules.: Cellular bilayer membranes are composed of phospholipid molecules with embedded proteins.
Incorrect - Disulfide bonds are formed between neighboring tyrosine residues and contribute to the stability of polypeptides: Disulfide bonds are formed between neighboring cysteine residues and contribute to the stability of polypeptides
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