PNB 2250 Exam 3 Uconn Questions and Answers

PNB 2250 Exam 3 Uconn Questions and Answers The loss of digestive wastes, CO2 and NH4+ are examples of _______________. - Ans:-excretion The regulation of H2O and solutes is via ___________________. - Ans:-osmoregulation Water moves from an area of ________ (low, high) osmolarity to an area of __________ (low, high) osmolarity - Ans:-low, high ___________: a chemical dissolved in a solvent (H2O is the only solvent we are interested in) [6.02]. ___________s occupy space within H2O - Ans:-solute Osmolarity : measure of the number of ____________ per _________ of H2O, expressed as osmoles/liter (OsM/L) or milliosmoles/liter (mOsM/L). - Ans:-solutes, liter Hypertonic (hyperosmotic): a comparison of the osmolarity of two solutions, with one solution have a ___________ number of solutes (and less H2O) than the other solution. - Ans:-greater Hypotonic (hypoosmotic): again a comparison of the the osmolarity of two solutions, with one solution have ___________ solutes (and more H2O) than the other solution. - Ans:-fewer ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 2/7 Isotonic (isoosmotic): two solutions with the _________ osmolarity and H2O content. - Ans:-same Which solution has the highest osmolarity? A) 1M/L sucrose B) 1M/L NaCl C) 0.1M/L CaCl2 D) 1M/L ZnCl2 - Ans:-D The movement of water across the cell membrane can ___________ cells - Ans:-destroy Because of the factors affecting diffusion, H2O will move from an area of higher concentration (low osmolarity) to an area of lower concentration (higher osmolarity) if the cell membrane is permeable to H2O [6.03]. The movement of H2O in this way is a very powerful force, capable of rupturing membranes and causing damage to animals. This force is known as ________________ ________________. - Ans:-osmotic pressure Placement of cells into which solution will cause them to burst? A) Isotonic ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 3/7 B) Hypotonic C) Hypertonic - Ans:-B Placement of cells in a ______________ solution (more H2O outside than inside the cell) causes H2O to rush into the cell, bursting it - Ans:-hypotonic Placement of cells in a _______________ solution (less H2O outside than inside the cell) causes H2O to leave the cell - Ans:-hypertonic Small solutes need integral ______________ to pass through the membrane - Ans:-proteins Solutes or water can cross a cell membrane via ___________, _______________, or ______________ - Ans:-pumps, transporters, channels Membrane solute permeability can require ______ - Ans:-ATP ________ have a solute-binding pocket exposed to the extracellular or intracellular aqueous environment. After solute binding, the energy inside _____ is used to drive a reversible conformational movement of the protein that exposes the solute-binding pocket to the other face of the