(1) Found in the same percentage in all proteins. (2) Stabilized by H bonds between -NH...
(1) Found in the same percentage in all proteins.
(2) Stabilized by H bonds between -NH and -CO groups.
(3) Found in globular proteins.
(4) Affected by amino acid sequence
(5) Includes all 20 standard amino acids in equal frequencies
(6) Hydrophobic interactions are responsible for the primary structure.
Which statements are true regarding beta-sheets? (4 correct answers)
Which statements are true regarding alpha-helices (3 correct answers)
Which are true for both alpha-helices and beta-sheets? (3 correct answers)
Which are true regarding neither alpha-helices and beta-sheets? (2 correct answers)
Homework Answers
1. (each molecule of protein usually have approximately 32% alpha helices and 21% beta sheets and also is not a fixed number for all proteins). so this is neither true for alpha helix nor for beta sheets
2. this istrue for alpha helix. in alpha helix usually -NH of first amino acid makes hydrogen bond with -CO of 5th amino acid residue. In beta sheets two or more region polypeptide chains which forms a sheet like structure are primarily stabilized by hydrogen bonds
3.It is true for both. They are found mainly in globular proteins
4. It is true for both. They mainly depends on the sequence of amino acid. For instance, proline will not bw able to form alpha helix because of cyclic residue group whereas Tryptophan, tyrosine and phenylalanine generally tends to form beta sheets.
5. neither true for alpha helix nor for beta sheets. It is not mandatory for either alpha helix or beta sheets
6. neither true for alpha helix nor for beta sheets. Primary structure is mainly due to linear structure of protein whereas Hydrophobic interactions are mainly responsible for the tertiary structures of proteins
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(1) Found in the same percentage in all proteins.
(2) Stabilized by H bonds between -NH...
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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...
Which of the following is true about proteins? a. Peptides linkages are made between the side...
Which of the following is true about proteins? a. Peptides linkages are made between the side chain and the carboxyl group. b. Hydrogen bonding between the NH and CEO of the backbone results in only alpha helices! c. Electrostatic interactions between the NH and C=O of the backbone results in only beta sheets. d. Quaternary structures of proteins involve multiple peptide chains interacting together.
Review| Constants| Periodic Table Protein structure is conceptually divided into four levels, from most basic to...
Review| Constants| Periodic Table Protein structure is conceptually divided into four levels, from most basic to higher order Primary structure describes the order of amino acids in the peptide chain. Secondary structure describes the basic three-dimensional structures, a-helices and B sheets. Tertiary structure describes how the secondary structures come together to form an individual globular protein. Quatemary structure results from individual proteins coming together to form multi-subunit protein complexes Part A Complete the following vocabulary exercise relating to the level...
QUESTION 2 Select the CORRECT statements (chose all that are correct). Secondary protein structures are held...
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1. Which of the following statements is consistent with the structural motifs in 1OPF? This protein...
1. Which of the following statements is consistent with the
structural motifs in 1OPF?
This protein has tertiary structure, where each subunit is a
large parallel beta barrel.
This protein has quaternary structure, where each subunit is a
large antiparallel beta barrel.
This protein has tertiary structure, where each subunit is a
large antiparallel beta barrel.
This protein has quaternary structure, where each subunit is a
large parallel beta barrel.
3. Given the information in the PDB entry for 1OPF,...
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...
Question 1 The protein in the diagram is (circle all that apply): Group of answer choices...
Question 1
The protein in the diagram is (circle all that apply):
Group of answer choices
a) a peripheral membrane protein
b) an integral membrane protein
c) a lipid anchored protein
Question 2
The protein shown in the diagram could potentially function as
(circle all that apply):
Group of answer choices
a) a receptor
b) a transmembrane anchor
c) a pore or channel
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The protein shown in the diagram has which of the following
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Distinguish between the different levels of protein structure, including primary, secondary, tertiary, and Question Prions are...
Distinguish between the different levels of protein structure, including primary, secondary, tertiary, and Question Prions are a type of protein implicated in bovine spongiform encephalopathy (BSE), also known as "mad cow disease," and related pathologies found in sheep (scrappie) and humans (Creutzfeldt-Jakob disease). The disease occurs when sections of an otherwise healthy protein misfold from alpha-helices to beta-pleated sheets, forming tightly packed sections of beta-pleated sheets that are difficult to break down. The disease propagates because the misfolded prions induce...
please answer all. 14. [6 pts) Indicate which of the following statements is True (T) or...
please answer all.
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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...
Which of the following is true about proteins? a. Peptides linkages are made between the side chain and the carboxyl group. b. Hydrogen bonding between the NH and CEO of the backbone results in only alpha helices! c. Electrostatic interactions between the NH and C=O of the backbone results in only beta sheets. d. Quaternary structures of proteins involve multiple peptide chains interacting together.
Review| Constants| Periodic Table Protein structure is conceptually divided into four levels, from most basic to higher order Primary structure describes the order of amino acids in the peptide chain. Secondary structure describes the basic three-dimensional structures, a-helices and B sheets. Tertiary structure describes how the secondary structures come together to form an individual globular protein. Quatemary structure results from individual proteins coming together to form multi-subunit protein complexes Part A Complete the following vocabulary exercise relating to the level...
QUESTION 2 Select the CORRECT statements (chose all that are correct). Secondary protein structures are held together by disulphide bridges/bonds. Alpha helices and beta sheets are common secondary protein structures. Tertiary protein structures are held together by covalent bonds only. Secondary protein structures are held together by hydrogen bonds only. All proteins have a quaternary protein structure. Amino acids linked with a peptide bond make up the primary protein structure.
1. Which of the following statements is consistent with the
structural motifs in 1OPF?
This protein has tertiary structure, where each subunit is a
large parallel beta barrel.
This protein has quaternary structure, where each subunit is a
large antiparallel beta barrel.
This protein has tertiary structure, where each subunit is a
large antiparallel beta barrel.
This protein has quaternary structure, where each subunit is a
large parallel beta barrel.
3. Given the information in the PDB entry for 1OPF,...
Question 1
The protein in the diagram is (circle all that apply):
Group of answer choices
a) a peripheral membrane protein
b) an integral membrane protein
c) a lipid anchored protein
Question 2
The protein shown in the diagram could potentially function as
(circle all that apply):
Group of answer choices
a) a receptor
b) a transmembrane anchor
c) a pore or channel
Question 3
The protein shown in the diagram has which of the following
(choose all that apply)?...
Problem 1. (15 pts) Multiple Choice Which of the following methods can be used to purify large amounts of proteins a. Hydrophobic chromatography b. Precipitation c. Equilibrium dialysis d. Polyacrylamide gel electrophoresis e. Ion exchange chromatography f. a, c, e g. a, b, c, d h. a, b, c, e i. All of the above Circle the one correct answer. a. Beta sheets are stabilized by H-bonds b. Ramachandran plots are determined by steric clashes between side chains and the...
Distinguish between the different levels of protein structure, including primary, secondary, tertiary, and Question Prions are a type of protein implicated in bovine spongiform encephalopathy (BSE), also known as "mad cow disease," and related pathologies found in sheep (scrappie) and humans (Creutzfeldt-Jakob disease). The disease occurs when sections of an otherwise healthy protein misfold from alpha-helices to beta-pleated sheets, forming tightly packed sections of beta-pleated sheets that are difficult to break down. The disease propagates because the misfolded prions induce...
please answer all.
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