23 Jul WHICH OF THE FOLLOWING ARE MECHANISMS BY WHICH IONS CAN BE TRANSPORTED INTO THE CELL FROM THE OUTSIDE?
Select one Show more Question 1 A protein pump (primary transporter) is capable of which of the following____? Select one: a. Make ATP to enable faciliated diffusion b. Move molecules from one side of the membrane to the other using energy from the hydrolysis of ATP c. Transfer ATP from areas of high concentration to areas of low concentration d. Phosphorylate ions in order to move them from one side of the membrane to the other Question 2 Which of the following are mechanisms by which ions can be transported into the cell from the outside? (you may choose more than one) Choose all that are correct a. exocytosis b. gated channel c. osmosis d. active transport e. passive diffusion through the membrane Question 3 The sequence of amino acids in a polypeptide chain determines the proteins ________ structure while the number of polypeptide subunits determines its _________ structure. Select one: a. quaternary; primary b. primary; tertiary c. secondary; quaternary d. primary; quaternary Question 4 Which of the following is NOT a component of the extracelullar matrix (ECM)? Select one: a. Proteoglycans b. Charged ions c. Polysaccharides d. DNA and RNA e. Proteins Question 5 The movement of water from a region of low solute concentration to a region of high solute concentration occurs by the process of _____. Select one: a. electro-chemical gradient b. equilibrium c. osmosis d. active transport Question 6 A triglyceride is made up of ___________ Select one: a. a phosphate group and three fatty acid chains b. a glycerol and two fatty acid chains c. none of these choices is correct d. a phosphate group and two fatty acid chains e. a glycerol and three fatty acid chains Question 7 Some proteins are amphipathic meaning that they contain nonpolar (hydrophobic) regions and polar (hydrophilic) ones. Where would you expect to find the hydrophobic and hydrophilic amino acid residues of a protein that spans a cell membrane? Select one: a. The hydrophobic amino acids would face outward in the portion of the protein that spans the membrane and come into contact with the hydrocarbon tails of the phospholipid bilayer. The hydrophilic proteins would either face inwards in the transmembrane region or concentrated in protein regions facing either side of the membrane. b. The hydrophobic regions of the protein would clump together in the protein interior through hydrophobic interactions while the hydrophilic regions would be oriented outward coming into contact with the phospholipid bilayer. c. All hydrophobic will be inside the lipid bilayer and all hydrophilic amino acids will be in either the cytoplasm or the extracellular space. d. Proteins are found only on the membrane surface. The hydrophilic regions would be attached to the phosphate groups of membrane phospholipids through ionic bonds while the hydrophobic groups would be oriented toward the extracellular fluid. Question 8 What types of interactions are responsible for the secondary structure of a protein? Select one: a. hydrogen bonds b. peptide bonds between side residues c. covalent bonds between side residues d. ionic bonds Question 9 Which of the following statements best describes the fluid-mosaic model of membrane structure? Select one: a. Membrane proteins contain only hydrophobic amino acids. b. Two layers of proteins are interspersed with phospholipids c. The phospholipid bilayer contains diverse proteins including some that coat either side and some that cross the lipid bilayer. d. Diverse protein can slide freely on both surfaces of a bilayer made of a mosaic of phospholipids. Question 10 All 20 amino acids have a(n) ________ functional group and a(n) ________ functional group but vary in their ________ group. Select one: a. side residue; carboxyl; amino b. amino; side residue; carboxyl c. carboxyl; amino; nitrogenous base d. carboxyl; amino; fatty acid e. carboxyl; amino; side residue f. amino; carboxyl; polymer Show less
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