419 Final - PollEverywhere Exam Questions & Answers

419 Final - PollEverywhere Exam Questions & Answers-(Lecture 1) Which cells in the body do not contain the entire genome? A. Lymphocytes B. Erythrocytes C. Beta Cells D. Neurons E. None of the above - B. Erythrocytes (Lecture 1) The secretion of hormones by the pituitary gland is an example of: A. Autocrine signaling B. Paracrine signaling C. Endocrine signaling D. Direct signaling across gap junction E. None of the above - C. Endocrine Signaling (Lecture 1) Two balloons are charged with an identical quantity and type of charge: -6.25 nC. They are held apart at a separation distance of 61.7 cm. Determine the magnitude of the electrical force of repulsion between them. A. 9.23x10-7 B. 10.34x10-6 C. 5.34x10-7 D. 15.89x10-7 E. None of the above - A. 9.23x10-7 (Lecture 2) Blood flows through an artery with a diameter of 5 mm at a velocity of 9 cms/. If the diameter of the artery then decreases to 3mm, what is the new velocity? - 25cm/s (Lecture 2) One liter of water of water contains 55.5 moles of water. Accordingly, the concentration of water in 1 liter of water is 55.5M. Water dissociation produces 10-7 M [H+] and 10^-7 M of [OH-]. Calculate Keq - 1.80x10-16 (Lecture 2) Voltage across a barrier is 80mV, and the barrier is permselective to K+. What is the K concentration ratio across the barrier? - Kin/Kout = 20.08 (Lecture 2) Solution A and Solution B are separated by a membrane whose permeability to urea is 2x10-5 cm/sec and whose surface area is 1 cm2. The concentration of urea in A is 10 mg/mL, and the concentration of urea in B is 1 mg/mL. The partition coefficient for urea is 10-3, as measured in an oil-water mixture. What are the initial rate and direction of net diffusion of urea? - Jx = 18x10-5 cm*m/s from A --> B (Lecture 2) The Na+ permeability of a lipid bilayer is 1x10-12 cm/s. If the [Na+] in plasma is 150 mM and in the cell is 15 mM. What is the rate of Na+ leakage into the cell? - Jx = 1.35x10-13 cm*m/s (Lecture 3) There are a variety of transporters for glucose that are called GLUT (for glucose transporter). The GLUT-1 transporter imports glucose into a variety of cell types. This is an integral membrane protein with a molecular weight of 45 kDa. Its Km for glucose is 1.5 mM. Glucose is typically about 100 mg% in the extracellular fluid. At what fraction of Qmax will glucose be transported at this concentration? - 0.78Qmax (Lecture 3) Where does the energy come from for movement of materials by passive transport? - Concentration gradient (Lecture 3) Where does the energy come from for movement of materials by primary active transport? - ATP (Lecture 3) Energy for secondary transport comes from concentration gradients. (T/F) - False, comes from the electrochemical gradient (Lecture 3) What method provides the fastest transport? A. Membrane channels B. Pumps C. Carriers - A. Membrane channels (Lecture 4) The concentration of nonpenetrating solutes in a solution, not the total osmolarity determines its tonicity - iso-, hypo- or hypertonic. (T/F) - True (Lecture 4) Solutes that readily diffuse through lipid bilayers (penetrating solutes) do not contribute to the tonicity of a solution. (T/F) - True (Lecture 4) What happens to an RBC placed in a hypoosmotic solution? A. Shrinks B. Swells C. Doesn't change D. Not enough information. - D. Not enough information