MCDB 111 M 2017 Section quiz 1A Key 8/9/17 Answer each question on your scantron form. Make sure your name, perm, and MCDB 111 Summer quiz 1 appears on the answer form. Each correct answer is worth half a point. 1. Which of the following is true of secondary active transport? a. It is saturable b. It can only move solutes from a region of high to low solute concentration c. It is directly coupled to ATP hydrolysis d. It is characterized by a linear relationship between flux rate and the extracellular solute concentration e. All of the above 2. The production of heat by the breakdown of fats in adipose tissue in order to compensate for a decrease in external temperature is an example of a. a steady state reaction b. Acclimatization c. Resetting of a set point d. homeostasis e. both a and d 3. The greatest proportion of cells in the nervous system fall into which of the following categories? a. Dendrites b. Glial cells c. Afferent neurons d. Efferent neurons e. Interneurons 4. Which of the following parameters does not have a direct effect on the flux of a molecule that is diffusing across a membrane? a. Density of the medium b. Temperature c. Ionic strength of the medium d. Surface area of the membrane e. Mass of the diffusing molecules 5. The critical feature that determines if a cell will shrink when exposed to a hypertonic solution is whether the cell membrane a. is more permeable to water than to solutes b. is more permeable to solutes than to water c. is equally permeable to water and solutes d. has a high cholesterol content e. contains stretchable molecules known as elastins 6. One type of facilitated glucose transporters are only active when extracellular glucose levels are high. This prevents loss of glucose from cells when extracellular glucose is low. This is an example of a. adaptation b acclimatization c. countertransport d. negative feedback e. channel gating7. Interstitial fluid differs from that of blood plasma in that the latter contains a higher concentration of a. Na+ b. K+ c. glucose d. protein e. lipids 8. Feedforward reactions are responses of a biological system in anticipation of a change in the environment. Which of the following would be an example of a feedforward reaction? a. An increase in respiration rate in response to an overcompensation of the body to a drop in blood pH b. An increase in the heart rate of a runner just prior to the start of a race c. Inhibition of the shivering reaction in response to a rise in body temperature b. Suppression of melatonin secretion by the pineal gland as a consequence to elevated blood melatonin c. Increased secretion of Na+ and water by the kidney in response to elevated blood pressure 9. An integrating center receives information directly from a/an a. afferent pathway b. sensor c. efferent pathway d. effector e. flux capacitor 10. The resting potential of a cell is characterized by a. constant loss of K+ from the cell via leak channels b. no net movement of Na+ into or out of the cell c. no net movement of K+ into or out of the cell d. Active transport of Na+ and K+ by the Na+K+ ATPase e. all of the above Note: Question 10 was not graded since this topic was not covered until the day of the
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