Assignment 3 Test Questions – Flashcards
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Suppose you discovered a new amino acid. Its R-group contains only hydrogen and carbon atoms. Predict the behavior of this amino acid.
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It is hydrophobic.
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Proteins are polymers of _____.
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amino acids
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What type of bond joins the monomers in a protein's primary structure?
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peptide
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Which of these illustrates the secondary structure of a protein?
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string with only two curls
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The secondary structure of a protein results from _____.
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hydrogen bonds
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What name is given to the process seen in this animation?
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dehydration synthesis
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This animation illustrates the functioning of a _____ protein.
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transport
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Arrow A is indicating a(n) _____ protein.
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structural
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Arrow D is indicating a _____ protein.
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receptor
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Which of these does NOT contain a structural protein?
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ovalbumin
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Defensive proteins are manufactured by the _____ system.
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immune
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Which of the following best describes primary structure in proteins?
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It is the sequence of amino acids in the complete protein.
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An isomer of a particular molecule is
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a molecule that has the same formula, but a different structure.
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Classify these amino acids as acidic, basic, neutral polar, or neutral nonpolar.
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basic: arginine neutral polar: asparagine neutral nonpolar: alanine
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Classify these amino acids as acidic, basic, neutral polar, or neutral nonpolar.
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acidic: glutamic acid neutral polar: threonine neutral nonpolar: tryptophan
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At the pH found in cells (about 7.0), what happens to the carboxyl group on an amino acid?
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It acts as an acid and loses a proton, giving it a negative charge.
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Complete the following vocabulary exercise relating to the level of structure in proteins.
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1. Quaternary structure is the result of two or more protein subunits assembling to form a larger, biologically active protein complex. 2. Secondary structure describes the alpha-helices and beta-sheets that are formed by hydrogen bonding between backbone atoms located near each other in the polypeptide chain. 3. Primary structure is the sequence of amino acids in a protein. 4. Tertiary structure is achieved when a protein folds into a compact, three-dimensional shape stabilized by interactions between side-chain R groups of amino acids.
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Which one of the following is not a component of each monomer used to make proteins?
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a phosphorous atom, P
