Which of the following is incorrect? a. The overall shape of an entire polypeptide including all its side chains is called its tertiary structure b. Only multimeric proteins have quaternary structure C. The amino acid sequence of a protein is called its primary structure Od. None; all the other choices are correct

Which of the following is incorrect? a. The overall shape of an entire polypeptide including all its side chains is called its tertiary structure b. Only multimeric proteins have quaternary structure C. The amino acid sequence of a protein is called its primary structure Od. None; all the other choices are correct

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter3: The Chemistry Of Life: Organic Compounds

Section: Chapter Questions

Problem 9TYU: Which of the following levels of protein structure may be affected by hydrogen bonding? (a) primary...

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Which of the following statements about protein structure is CORRECT O a. Fibrous proteins can have rigid quaternary structure O b. The stability of the quaternary structure in proteins is mainly a result of covalent bonds among the subunits O c. The denaturation of proteins always leads to irreversible loss of secondary and tertiary structure d. The information required for the correct folding of a protein is contained in the specific sequence of amino acids along the polypeptide chain O e. The formation of a disulfide bond in a protein requires that the two participating cysteine residues be adjacent to each other in the primary sequence of the protein
Which of the following statement about proteins is correct a. alpha helix and Beta pleated sheets are considered quaternary structures b. a single polypeptide only has primary sytructure, secondary, tertiary, and quaternary structures require more than one polypeptide c. there are 30 essential amino acids that are the monomer building blocks of proteins d. polypeptides have a distinct polarity (directionality) with one end refered to as the free amino end, and the other called the free carboxyl end
Which of the following statements are correct about the native state of a protein (select all that apply)? A. Polar sidechains commonly interact with water B. Hydrophobic amino acids tend to be on surface of protein C. The sidechains of polar amino acids are most commonly found in the central core of a protein D. Formation of an alpha-helix is primarily driven by hydrogen bonds between the protein main chain, not sidechains. E. Secondary structure is largely driven by hydrophobic interactions
Which of the following most directly applies to the formation of the secondary structures of proteins? A B с D formation of ionic bonds between the R groups of two polypeptides formation of nonpolar interactions between two R groups on the same polypeptide formation of covalent bonds via dehydration reactions between two amino acids formation of hydrogen bonds between between amino and carboxyl groups
Which of the following statements are correct about protein structure (select all that apply)? A. Post-translational modifications such as glycosylation or phosphorylation may alter the structure of a protein B. Only amino acids with a net charge may interact with other amino acids C. The 3D structure of a protein is determined primarily by the protein backbone/main chain conformation while the amino acid sidechains play only a minor role. D. Hydrophobic interactions play a key role in protein folding E. Amino acid sidechains contribute to 3D structure through their ability to form hydrogen bonds with other amino acids
In a protein, a mutation occurs and results in phenylalanine being replaced by an alanine. This would. Select one: a. Always change the primary structure of the protein, never change the tertiary structure of function. O b. Always change the primary structure of a protein, sometimes affect tertiary structure and function. c Never change the primary structure, always affect secondary and tertiary structure and function. O d. Sometimes change the primary structure of a protein, always affect the tertiary structure, and sometimes affect function.
Which of the following statements are true? The local folding of the polypeptide in some regions gives rise to the secondary structure of the protein. The most common secondary structures are the α-helix and β-pleated sheet structures. Certain amino acids have a propensity to form an α-helix, while others have a propensity to form a β-pleated sheet. Select the correct answer below: 1 and 2 1 and 3 2 and 3 all of the above
Oftentimes, the major challenge in the determination of protein structure via X-ray crystallography is the production of good crystals. One common approach is to crystallize fragments of the whole protein instead of crystallizing the whole protein. If you were to cleave a protein into fragments that will still retain the folding of that fragment in the whole protein, where is the best location to perform the cleavage? O At the ends of each alpha helix. O At the ends of a protein motif. O At the points connecting protein domains. O At the ends of beta strands.
A. A macromolecule composed of one or more polypeptides B. The monomer of polypeptides. C. The specific sequence of amino acids in a polypeptide. D. Structure of coils and/or folds of a polypeptide strueture. E. Structure of polypeptide resulting from interactions between R-groups. Contributes to unique 3D shape of molecule. F. Two or more polypeptides interacting to form a single functional unit. 1. Protein 2. amino acid 3. primary structure 4. secondary structure 5. tertiary structure 6. quaternary structure
Which of the following is incorrect concerning protein structure determination by X-ray crystallography? Choose one: O A. X-ray crystallography provides dynamic information about protein structure. O B. A 1.5 Å resolution structure is better than a 3 Å resolution structure. O C. Isomorphous replacement is used to aid phase determination. O D. Highly ordered crystals are required.
Which of the following is NOT TRUE about secondary structure in proteins? (More than one may apply) A. Stabilized by non-covalent bonds B. Is illustrated by DnaA molecules interacting in the ori C. Unravels at high temperatures when intramolecular non-covalent bonds are destroyed D. Occurs in a subregion of a protein E. Exemplified by beta sheets F. Describes the order of amino acids in a polypeptide
which of the following is correct about the structure of proteins? a- the number of peptide bonds is equivalent to the number of amino acid residues b- the secondary structure of proteins are mostly stabilized by hydrophobic interactions c- protiens mostly composed of polar amino acids will have an elongated (fibrous) tertiary structure d- the quaternary structure of a protein is formed between or among similar polypeptides only