NUTRITION-MINDTAP (1 TERM)
15th Edition
ISBN: 9781337907101
Author: Sizer
Publisher: CENGAGE L
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Textbook Question
Chapter 6, Problem 1SC
The basic building blocks for protein are
a. glucose units.
b. amino acids.
c. side chains.
d. saturated bonds.
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Which of the following statement about quaternary structure of protein is correct?
Select one:
a.
Quaternary structure is a force between different polypeptides.
b.
Hydrogen bond is an only force found in quaternary structure.
c.
Quaternary structure contains one polypeptide.
d.
Quaternary structure is an unfolded form of protein.
Which of the following statements is FALSE?
Select one:
a.
Secondary structure of a protein determines how it folds up into a unique three dimensional structure.
b.
Three dimensional structure of a protein determines the function of a protein.
c.
Primary structure of a protein determines how it folds up into a unique three dimensional structure.
d.
Amino acid sequence is absolutely important for a particular protein.
Proteins are the dominant structural and functional molecules in a cell.
Which one of the following statements about proteins is NOT correct?
A.
The native conformation of a protein is usually arrived at very quickly after synthesis.
B.
Hydrogen bonding is the only type of bonding that gives rise to secondary structure.
C.
Urea denatures proteins by disrupting the interactions among non-polar (hydrophobic) amino acids
D.
Most proteins consist of a single polypeptide and thus do not have quaternary structure.
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- Match the level of protein structure to its description: Primary Secondary Tertiary Quaternary A. Folding due to interactions among the peptide backbone B. Interactions among multiple polypeptide chains C. Sequence of amino acids D. Folding due to interactions among side chainsarrow_forwardDenaturation of a protein A. adds hydrogen bonds to the primary level of protein structure. B. breaks hydrogen bonds in the primary level of protein structure. C. adds hydrogen bonds to the secondary and tertiary levels of protein structure. D. breaks hydrogen bonds in the secondary and tertiary levels of protein structure.arrow_forwardWhich of the following statements is incorrect about disulfide bonds? a. They form between two cysteine amino acids.b. They are noncovalent.c. They contribute to the tertiary structure of some proteins.d. They contribute to the quaternary structure of some proteins.e. They involve the loss of two hydrogen atoms.arrow_forward
- This structure of a protein comes from the further bending and folding of pleated sheets and helices: A. primary B. secondary C. tertiary D. quaternaryarrow_forwardVariations in three-dimensional shapes among proteins are due tobonding between thea. amino groups.b. R groups.c. ion groups.d. H atomsarrow_forwardTwo amino acids of the standard 20 contain sulfur atoms. They are: a. cysteine and serine. b. cysteine and threonine. c. methionine and cysteine d. methionine and serine e. threonine and serine.arrow_forward
- Which of the following statements is/are TRUE for globular proteins? A. sensitive to changes in pH & heat B. regular amino acid sequence C. soluble in water D. structural rolearrow_forwardWhich of the following describes the tertiary structure of proteins? A. Helices and sheets formed from hydrogen bonds between the amino acids of polypeptides B. The functional domains that form from interactions between different parts of the polypeptide C. The association of multiple polypeptides D. The linear sequence of amino acids making up the polypeptidearrow_forwardThe tertiary structure of a protein is established by: a. The sequence of amino acids in the protein b. The molecular weight of the protein c. The total number of amino acids in the protein d. The number of disulfide bridges in the protein e. The net charge of the the protein at physioloical pH.arrow_forward
- Which of the following is a drawback of using base hydrolysis during amino acid composition? A. Protonation of basic amino acids. B. Dissociation of acidic amino acids. C. Denaturation of the protein. D. Racemization of certain amino acids.arrow_forwardNaCl (a salt) can disrupt protein structure. This is true because a protein containing the amino acid glutamic acid can form ______ bonds with Na+. Select one: a. alpha-helix b. barry c. ionic d. peptide e. hydrogenarrow_forwardWhich of the following bonding types is the most important in the nonaqueous interfaces between protein subunits? a. van der Waals interactions b. the hydrophobic effect c. ionic bonds d. disulfide bridgesarrow_forward
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