MCDB 111 Su 2017 Section quiz 2A 8/16/17 Answer each question on your Scantron form. Make sure your name, perm, date, and MCDB 111 Summer quiz 2 appears on the answer form. Each correct answer is worth half a point. 1. Which type of muscle is capable of spontaneous contractions? a. Smooth muscle b. Cardiac muscle c. Skeletal muscle d. a and b e. a, b, and c 2. A graded potential in a neuron a. may result in either depolarization or hyperdepolarization b. has a threshold c. is an all or none event i.e. all graded potentials have the same amplitude d. results in neurotransmitter release e. both b and d 3. Creatine phosphate allows skeletal muscle contraction to take place at the maximum rate because a. It rapidly regenerates ATP through direct phosphorylation of ADP b. It maximizes the rate of ATP production by serving as an electron donor in oxidative phosphorylation c. It directly phosphorylates myosin d. It directly phosphorylates troponin e. It directly phosphorylates tropomyosin 4. Which of the following is true of smooth muscle? a. Cells are multinucleate b. Cells are branched c. Crossbridge sliding is promoted by Ca2+-dependent activation of myosin light chain kinase d. Mature smooth muscle cells are non-dividing e. None of the above statements are true 5. Which of the following is true of cardiac muscle? a. It is the only type of tissue that produces spontaneous action potentials b. Cardiac muscle cells are multinucleate c. It lacks sarcoplasmic reticulum d. Cardiac cells are electrically connected via intercalated disks e. All of the above statements are true 6. Which of the following is true of steroid hormones? a. Are transported through the bloodstream bound to a steroid receptor b. Are highly water soluble c. Are produced in an inactive state and are enzymatically activated d. Bind exclusively to cell surface receptors e. None of the above7. Multiple sclerosis results from a. a loss of microglia due to an infectious disease of unknown origin b. a reduction in the number of synapses due to toxic levels of intracellular calcium c. X-linked inheritance of a dysfunctional dystrophin gene d. skeletal muscle atrophy resulting from chronic ATP depletion e. demyelination of neurons as the result of an autoimmune disease 8. The rigor conformation step in skeletal muscle contraction occurs when a. ATP is bound to myosin heads b. neither ATP nor ADP is bound to myosin heads c. ADP and Pi are bound to myosin heads b. Pi has been released, leaving ADP bound to myosin heads c. Only Pi is bound to myosin heads 9. Which of the following is not associated with synaptic neurotransmission? a. SNARE proteins b. inhibitory autoreceptors c. gap junctions d. ligand gated ion channels e. G protein coupled receptors 10. The function of sarcoplasmic reticulum in skeletal muscle contraction is a. storage of calcium ions b. storage of sodium ions c. storage of acetylcholine d. storage of acetylcholine esterase e. none of the
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