LS7C Final Practice Questions

LS7C Final Review Practice Questions Spring 2021 LS 7C | Spring 2021 Practice Questions 02 Practice Questions Multiple Choice 1. Malformation of which cytoskeletal structures may be linked to an inability to contract muscle? a) Microtubules b) Intermediate filaments c) Microfilaments d) Centrioles 2. Extracellular fluids are LEAST likely to move through the space between cells that are joined by which type of intercellular junction? a) Gap junction b) Desmosome c) Tight Junctions d) hemidesmosomes 3. During one step in the pathway shown on the right, the enzyme glycogen synthase (synthesizes glycogen) is phosphorylated, which inactivates the enzyme. If a toxin prevents the phosphorylation of glycogen synthase during this pathway, which of the following will most likely occur when epinephrine comes into contact with its receptor? LS 7C | Spring 2021 Practice Questions 03 a) Adenylyl cyclase will be unable to catalyze the conversion of ATP to cAMP. b) Glycogen breakdown will still occur, but glycogen synthesis will not be affected. c) Glycogen phosphorylase will phosphorylate glycogen synthase to prevent new glycogen from being made. d) The epinephrine receptor will no longer recognize epinephrine. 4. An action potential: a) involves the influx of negative ions to depolarize the membrane b) involves the outflux of negative ion s to depolarize the membrane c) involves the outflux of positive ions to depolarize the membrane d) is essential for nerve impulse propagation 5. How would action potentials be affected in a myelinated axon if nodes are far apart? a) Action potentials mi ght travel more quickly b) Action potentials might travel more slowly c) Action potentials would not be affected d) Action potentials might stop 6.During an action potential, why is there a hyperpolarization phase? a) The sodium -potassium pump is active b) Voltage -gated potassium channels remain open c) Negatively charged chloride ions enter the cell to end the action potential LS 7C | Spring 2021 Practice Questions 04 d) Voltage -gated sodium channels remain open 7. A drunk person often loses balance as he walks. This happens because alco hol also affects part of the brain that controls body balance. Which part of the brain is affected? a) Cerebrum b) Medulla c) Cerebellum d) Hypothalamus 8. The lobe that contains the primary motor area that enables voluntary control of skeletal muscle movements: a) parietal lobe b) temporal lobe c) occipital lobe d) frontal lobe 9. Which branch of your nervous system is activated when you are about to write a midterm exam? a) sympathetic nervous system b) parasympathetic nervous system c) so matic nervous system d) afferent nervous system 10. Afferent nerves are called _______, and motor nerves are called _______. a) motor nerves; sensory nerves b) peripheral nerves; cranial nerves c) mixed nerves; motor nerves d) sensory nerves; efferent nerves 11. What happens when blood sugar levels become too high? a) Insulin is secreted, causing the conversion of glucose to glycogen. b) Glucagon is secreted, causing the conversion of glucose to glycogen. c) Insulin is secreted, causing the co nversion of glycogen to glucose. d) Glucagon is secreted, causing the conversion of glycogen to glucose. 12. Which of the following hormones would be expected to increase if you were studying all day for a test and skipped breakfast and lunch? a) Glucagon b) Calcitonin c) Insulin d)Growth Hormone 13. Which hormone increases basal metabolic rate in the body? a) Parathyroid Hormone b) Thyroid Hormone c) Insulin