Multiple ChoiceThe primary building blocks (monomers) of proteins are: a) Glucose molecules.b) Lipids.c) Nucleotides.d) Amino acids.e) None of these.3807views22rank
Multiple ChoiceWhich two functional groups are always found in amino acids?a) Carbonyl and amino groups.b) Carboxyl and amino groups.c) Amino and sulfhydryl groups.d) Hydroxyl and carboxyl groups.8144views28rank
Multiple ChoiceWhat term is used for an amino acid chain that has greater than 50 covalently linked amino acids?a) Protein.b) Peptide.c) Amino acid.d) Polypeptide.3324views30rank
Multiple ChoiceThe specific amino acid sequence in a protein is its:a) Primary structure.b) Secondary structure.c) Tertiary structure.d) Quaternary structure.3621views21rank
Multiple ChoiceWhich of the following is true of protein structure?a) Peptide bonds are formed by hydrolysis.b) Peptide bonds join the amine group on one amino acid with the R group of another amino acid.c) Secondary protein structures are caused by hydrogen bonding between atoms of the peptide backbone.d) Tertiary protein structure emerges when there is more than one polypeptide in a protein.4353views28rank3comments
Multiple ChoiceWhat is the role of a chaperone protein?a) Assist in RNA and DNA folding.b) Assist in membrane transport.c) Assist in protein denaturation.d) Assist in dehydration synthesis reactions.e) Assist in protein folding or re-naturing.2773views27rank
Multiple ChoiceThe overall three-dimensional shape of a single polypeptide is called its __________. 1088views
Multiple ChoiceWhich of the following lists ranks these molecules in the correct order by size from smallest to largest? 1200views1rank
Multiple ChoiceWhich of the following represents a specific description of a polypeptide? 1163views1rank
Multiple ChoiceEnzyme molecules require a specific shape to perform their catalytic function. Which of the following might alter the shape of an enzymatic protein? 1045views1rank
Multiple ChoiceThe α helix and β pleated sheet represent which level of protein structure? 1006views2rank
Textbook QuestionWhat two functional groups are bound to the central carbon of every free amino acid monomer? a. an R-group and a hydroxyl group b. an N—H group and a ═(C═O) group c. an amino group and a hydroxyl group d. an amino group and a carboxyl group1347views
Textbook QuestionWhat type of bond is directly involved in the formation of an α-helix? a. peptide bonds between amino acid residues b. hydrogen bonds between amino acid residues c. van der Waals interactions between nonpolar residues d. disulfide bonds between cysteine residues762views
Textbook QuestionWhat type of information is used to direct different polypeptides to fold into different shapes?670views
Textbook QuestionThe structural level of a protein least affected by a disruption in hydrogen bonding is the a. primary level. b. secondary level. c. tertiary level. d. quaternary level.1509views
Textbook QuestionIf a cell were to use only 10 of the 20 possible amino acids, how much effect would you expect this to have on protein diversity? Calculate and compare the number of different sequences that can be generated by randomly assembling either 10 or 20 amino acids into peptides that are five residues long.935views
Textbook QuestionExplain how molecular chaperones facilitate protein folding in many different polypeptides, each with their own specific shape.767views
Textbook QuestionDifferent proteins are composed of different sequences of . a. sugars; b. lipids; c. fats; d. amino acids; e. carbohydrates1032views
Textbook QuestionWhy are proteins not considered to be a good candidate for the first living molecule? a. Their catalytic capability is not sufficient for most biological reactions. b. Their amino acid monomers were not likely present in the prebiotic soup. c. They cannot serve as a template for replication. d. They could not have polymerized from amino acid monomers under early Earth conditions.1173views
Textbook QuestionPredict the effect on protein function if each polypeptide adopted only a single, inflexible shape based on its primary structure.766views
Textbook QuestionProteins may function as . a. genetic material; b. cholesterol molecules; c. fat reserves; d. enzymes; e. all of the above935views
Textbook QuestionBased on what you know of the peptide bonds that link together amino acid residues, why would proline's side chain reduce the flexibility of the backbone?840views
Textbook QuestionWhich structural level of a protein would be least affected by a disruption in hydrogen bonding? a. primary structure b. secondary structure c. tertiary structure d. quaternary structure1284views
Textbook QuestionMake a concept map (see BioSkills 12) that relates the four levels of protein structure and shows how they can contribute to the formation of hemoglobin. Your map should include the following boxed terms: Primary structure, Secondary structure, Tertiary structure, Quaternary structure, Amino acid sequence, R-groups, αα-helices, and ββ-pleated sheets.1031views
Textbook QuestionMost proteins are soluble in the aqueous environment of a cell. Knowing that, where in the overall three-dimensional shape of a protein would you expect to find amino acids with hydrophobic R groups?1136views
Textbook QuestionWhat are the two types of secondary structures found in polypeptides, and what maintains them? What stabilizes the tertiary structure of a polypeptide?909views
Textbook QuestionHow can a cell make many different kinds of proteins out of only 20 amino acids? Of the myriad possibilities, how does the cell 'know' which proteins to make?1014views
Textbook QuestionWhat two functional groups are bound to the central carbon of every free amino acid monomer?a. an R-group and a hydroxyl groupb. an amino group and a hydroxyl groupc. an amino group and a carboxyl group
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