Homework Answers
Answer to part
a: Since, enthalpy change is related to the number of bonds
(the difference between the the energy required to break the bonds
and energy gained by the formation of new bonds). Here (N-4)
hydrogen bonds are present. The enthalpy term is written as
.
The entropy is a state of function. Therefore, entropy would
depend on number of molecules take part in the reactant. Therefore,
the entropy change is written as 
.
Answer to part b:
At melting temperature Tm the system is in
equilibrium. Thus 
.
Answer to part c:
When N = 4, the graph will converge because then Tm = 0.
Add Answer to:
Proteins are polymers of amino acids that can exist in ordered structures stabilized by a variety...
5. Which of the following molecules form complex structures linked by covalent bonds through Lys, HyLys,...
5. Which of the following molecules form complex structures linked by covalent bonds through Lys, HyLys, or His residues? A) Collagen B) Alpha keratin C) Hemoglobin D) Myoglobin E) Beta barrels 6. Which of the following correlates to the classic experiment demonstrating that reduced and denatured RNase A could refold into the native form? A) Disulfide bonds do not stabilize folded proteins B) Reducing agents denature proteins C) 1° structure can determine 3° structure D) Urea cleaves disulfide bonds E)...
(2%) Indicate which secondary structure or structures (α -helix, β -pleated, random coil) will the following...
(2%) Indicate which secondary structure or structures (α -helix,
β -pleated, random coil) will the following peptide adopt in an
aqueous solution at pH 7
(2%) The unfolding of the alpha helix of a polypeptide to a
randomly coiled conformation is accompanied by a large decrease in
a property called specific rotation, a measure of
a solution’s capacity to rotate circularly polarized light.
Polyglutamate, a polypeptide made up of only L-Glu residues, has
the alpha helical
conformation at pH 3....
Proteins are made from chains of amino acids. The amino acids are joined together by structures...
Proteins are made from chains of amino acids. The amino acids
are joined together by structures called peptide
bonds.
Draw the dipeptide that results when a peptide bond is formed
between the two glycine molecules shown here. (Figure 1) Draw it as
it would occur at the pHpH of most body fluids.
Draw the molecule on the canvas by choosing buttons from the
Tools (for bonds), Atoms, and Advanced Template toolbars. The
single bond is active by default. Include all...
Question 1 (0.5 points) Saved Proteins are formed by joining together. carboxylic acids fatty acids amino...
Question 1 (0.5 points) Saved Proteins are formed by joining together. carboxylic acids fatty acids amino acids none of the above Question 2 (0.5 points) Which two functional groups does an amino acid contain? amine and carboxylic acid carboxylic acid and amide amide and heterocyclic ring heterocyclic ring and amine Question 3 (0.5 points) Do amino acids commonly exist in nature as neutral molecules with all uncharged atoms? Yes No Question 1 (0.5 points) What is a protein? A polymer...
Question 11. Certain amino acids destabilize or prevent formation of alpha-helices. Which amino acid is more...
Question 11. Certain amino acids destabilize or prevent formation of alpha-helices. Which amino acid is more likely to be found in these structures based on its charge and R-group size? A. Glycine B. Proline C. A sequence of several Glutamate D. A sequence of several Lysine E. Alanine Question 12. Which of the following is least likely to result in protein denaturation? A) Altering net charge by changing pH B) Changing the salt concentration C) Disruption of weak interactions by...
Identify the structure of amino acids, and describe the process by which they join together to...
Identify the structure of amino acids, and describe the process by which they join together to form polypeptides. Describe the 4 different groups of amino acids and their properties (Neutral, Polar, Acidic, Basic). Describe the levels of structure of proteins (primary, secondary, tertiary, and quaternary), including what bonds and interactions occur at EACH level. Describe denaturation of a protein and indicate how temperature and pH affect the protein functions. Describe the major functions of proteins
Question 10 (4 points) Although all protein structures are unique, there are common structural building blocks...
Question 10 (4 points) Although all protein structures are unique, there are common structural building blocks that are referred to as regular secondary structures, Some proteins have alpha-helices, some have beta-sheets, and still others have a combination of both. What makes it possible for proteins to have these common structural elements? 12 15 a) the hydrophobic-core interactions. b) hydrogen bonds that form along (alpha helices) or between (beta sheets) polypeptide backbones. c) side-chain interactions d) specific amino acid sequences. 7...
6) Proteins are composed of amino acids polymerized into long chains. The structure of a protein...
6) Proteins are composed of amino acids polymerized into long chains. The structure of a protein - that is, its overall shape and how the chains are "folded” around each other - is very important for its function. In an aqueous environment, in an active, folded state the hydrophilic amino acids in the protein are facing outwards exposed to the water and the hydrophobic amino acids are hidden away from the water in the core of the protein. In a...
1) Select all that apply. Globular proteins: a)are found in hair and wool. b)include myoglobin and...
1) Select all that apply. Globular proteins: a)are found in hair and wool. b)include myoglobin and collagen. c)are usually water soluble. d)aggregate in aqueous media. e)are often made of β-pleated sheet and α-helix sections wrapped into compact structures. 2) Select all that apply. The Bohr effect: a)depends on the atomic orbital structure of hydrogen. b)can be summarized as a reduction in the oxygen affinity of hemoglobin with decreasing pH. c)is explained by the protonation of key amino acids, including the...
COLOR 2 mlogg albumen 2 mL. honey 2 ml. amino acid solution 2 mL. distilled water...
COLOR 2 mlogg albumen 2 mL. honey 2 ml. amino acid solution 2 mL. distilled water 2 mL. peosein solution bWhich contains more protein (C-N bonds), egg albu- men or honey? How can you tell? Amino acid Amino ackd e. Do free amino acids have peptide bonds? d. What are the functions of proteins in living organisms? но HOH O Polypeptide chain Figure 6.7 A peptide bond joins two amino acids, and pepside bonds link mmany amino acids to form...
5. Which of the following molecules form complex structures linked by covalent bonds through Lys, HyLys, or His residues? A) Collagen B) Alpha keratin C) Hemoglobin D) Myoglobin E) Beta barrels 6. Which of the following correlates to the classic experiment demonstrating that reduced and denatured RNase A could refold into the native form? A) Disulfide bonds do not stabilize folded proteins B) Reducing agents denature proteins C) 1° structure can determine 3° structure D) Urea cleaves disulfide bonds E)...
(2%) Indicate which secondary structure or structures (α -helix,
β -pleated, random coil) will the following peptide adopt in an
aqueous solution at pH 7
(2%) The unfolding of the alpha helix of a polypeptide to a
randomly coiled conformation is accompanied by a large decrease in
a property called specific rotation, a measure of
a solution’s capacity to rotate circularly polarized light.
Polyglutamate, a polypeptide made up of only L-Glu residues, has
the alpha helical
conformation at pH 3....
Proteins are made from chains of amino acids. The amino acids
are joined together by structures called peptide
bonds.
Draw the dipeptide that results when a peptide bond is formed
between the two glycine molecules shown here. (Figure 1) Draw it as
it would occur at the pHpH of most body fluids.
Draw the molecule on the canvas by choosing buttons from the
Tools (for bonds), Atoms, and Advanced Template toolbars. The
single bond is active by default. Include all...
Question 1 (0.5 points) Saved Proteins are formed by joining together. carboxylic acids fatty acids amino acids none of the above Question 2 (0.5 points) Which two functional groups does an amino acid contain? amine and carboxylic acid carboxylic acid and amide amide and heterocyclic ring heterocyclic ring and amine Question 3 (0.5 points) Do amino acids commonly exist in nature as neutral molecules with all uncharged atoms? Yes No Question 1 (0.5 points) What is a protein? A polymer...
Question 11. Certain amino acids destabilize or prevent formation of alpha-helices. Which amino acid is more likely to be found in these structures based on its charge and R-group size? A. Glycine B. Proline C. A sequence of several Glutamate D. A sequence of several Lysine E. Alanine Question 12. Which of the following is least likely to result in protein denaturation? A) Altering net charge by changing pH B) Changing the salt concentration C) Disruption of weak interactions by...
Question 10 (4 points) Although all protein structures are unique, there are common structural building blocks that are referred to as regular secondary structures, Some proteins have alpha-helices, some have beta-sheets, and still others have a combination of both. What makes it possible for proteins to have these common structural elements? 12 15 a) the hydrophobic-core interactions. b) hydrogen bonds that form along (alpha helices) or between (beta sheets) polypeptide backbones. c) side-chain interactions d) specific amino acid sequences. 7...
6) Proteins are composed of amino acids polymerized into long chains. The structure of a protein - that is, its overall shape and how the chains are "folded” around each other - is very important for its function. In an aqueous environment, in an active, folded state the hydrophilic amino acids in the protein are facing outwards exposed to the water and the hydrophobic amino acids are hidden away from the water in the core of the protein. In a...
COLOR 2 mlogg albumen 2 mL. honey 2 ml. amino acid solution 2 mL. distilled water 2 mL. peosein solution bWhich contains more protein (C-N bonds), egg albu- men or honey? How can you tell? Amino acid Amino ackd e. Do free amino acids have peptide bonds? d. What are the functions of proteins in living organisms? но HOH O Polypeptide chain Figure 6.7 A peptide bond joins two amino acids, and pepside bonds link mmany amino acids to form...
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