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Exam I Key - Page i of(1 GEN BIO BIOS 10162 EXAM 3 SPRING...

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Unformatted text preview: Page i of (1 GEN BIO -- BIOS 10162 EXAM 3 SPRING 2008 1. Homeostasis refers to the tendency to keep body systems far?“ a. matched to the external environment. 1‘ E ‘6 b the same relative to one another. @n a steady state over time. d. under the control of the brain. e. at the same specific temperature. 2. The myelin sheath that surrounds some axons in the peripheral nervous system is formed by a. neurons. . d. synapses. ’chwann cells. e. oligodendrocytes. c. bacteria that have invaded the nervous system. 3. The magnitude of a receptor potential a. depends on the strength of the incoming action potential. b. remains high even after along period of stimulation. c. is the same no matter what the type of stimulus. d. depends on the amount of nemotransmitter released. fleets the frequency of resulting action potentials. 4. Neurotransmitters a. have multiple types of receptors. b. may be excitatory or inhibitory. 0. may have different effects in difiercnt tissues. d. include dopamine and serotonin, which are monoamines. .All of the above 5. In the homeostatic mechanism that controls testosterone vels in men, which element is the testes. a. The testes are the variable. The testes are the effector. b. The testes are the receptor. e. The testes are the stimulus. c. The testes are the integrating center. 6. The resting potential of a neuron is primarily produced by a. voltage-gated channels in the membrane. - chemically gated channels in the membrane. rmanently open potassium channels in the membrane. (1. the concentration difference in Na+ across the membrane. e. blockage of the sodium-potassium pump. 7. The neurohormones antidiuretic hormone (vasopressin) and oxytocin are produced by the anterior pituitary and released by the posterior pituitary. 0 hypothalamus and released by the posterior pituitary. c. pituitary and signal to the hypothalamus. d. hypothalamus and signal to the brain. e. pituitary and signal to the reproductive organs. Page 2 of 6 8. What happens if Na+ channels open on the membrane of a resting neuron? a. The cell will become hyperpolarized. b. Sodium ions will move out of the cell. @Sodium ions will move into the cell. d. Sodium can reach equilibrium and the membrane voltage goes to zero. e. Both a and b are correct. 9. Which type of tissue is adipose tissue? womective b. Epithelial 0. Matrix d. Muscle e. Nervous 10. Which of the following statements about acetylcholine is false? a. Acetylcholine is a neurotransmitter. b. Acetylcholine is found at mammalian neuromuscular junctions. c. Both smooth muscles and skeletal muscles respond to acetylcholine. d. Acetylcholine is degraded by acetylcholinestcrase. .kcetylcholine increases contractility of the heart. 11. The rate of a particular biological function is X at 15°C. Which of these statements about the rate of that function at 25°C is true? (9 lfthe Qw were 1, the rate would be x. b. If the Que were 1, the rate would be 25. c. If the Q13 were 2, the rate would be X. d. If the Q“; were 3, the rate would be 2X. 6. If the Q19 were 3, the rate would be 30. 12. The vertebrate thermoregulatory center (‘filermostaf is located in the a. pons. b. cerebellum. c. hypophysis. d. medulla. .rypothalamus. 13. Receptor potentials produce action potentials in two ways: by generating action potentials within the sensory cells, or by causing the release of , which induces an associated neuron to generate action potentials. __ a. a hormone b. ATP 0. interleukin neurotransmitter e. glucagon 14. Which one of the following is an example of negative feedback? a. When body temperature rises, the temperature set point rises. b- When estrogen levels fall in women, the uterine endometrium is shed. c. When blood glucose levels rise, insulin levels fall. When thyroid hormones levels rise, TRH levels fall. 6. When oxytocin levels rise, the uterus contracts more strongly. 15. Which one of the following hormones directly stimulates melting in an insect larva? a. Brain hormone .Eedysone c. Juvenile hormone d. Moltin e. Prolactin '16. Which one of the following is the correct order of communication in the retina? & photoreceptor; bipolar cell; ganglion cell I. photoreceptor; ganglion cell; bipolar cell c. bipolar cell; ganglion cell; photoreceptor d. bipolar cell; photoreceptor; ganglion cell c. ganglion cell; bipolar cell; photoreceptor Page 3 of ii 17. A decrease in the amplitude of a receptor potential in the presence of a continuing stimulus is called a. habituation. —l b adaptation c. sensitization. d. transduction. e. localization. 18. Pheromones are chemical signals that can signal, for example, from to a. one neuron; another b. the peripheral nervous; the central nervous system c. prey; predator d. parasite; host ‘emale; male within a species 19. Which one of the following is NOT one of the distinct chemical 3,: ups to which hormones belong? a. Steroids 13. Proteins c. Peptides @ arbohydrates e. Amines 20. Which of the following is the correct order of the structures through which sperm pass fiom the time they are produced to ejaculation? a. Vas deferens, seminiferous tubules, epididymis, urethra b. Epididyrnis, seminiferous tubules, vas deferens, urethra c. Seminiferous tubules, vas deferens, epididymis, urethra .Serniniferous tubules, epididymis, vas deferens, urethra e. Vas deferens, urethra, epididyrnjs, seminiferous tubules 21. Portal blood vessels connect the to the . a. hypothalamus; brain . d. anterior pituitary; posterior pituitary b. hypothalamus; posterior pituitary e. pancreas; liver @‘Iypothalamus; anterior pituitary 22. The target tissues of hormones are those tissues that a. the particular hormone can actually penetrate. b. have specific enzymes with which hormones directly interact. c. have high concentrations of the “second messenger.” @have receptors for the particular hormone. 23. Which one of the following sets of vertebrate hormones are produced in the anterior pituitary gland? a. Somatostatin, antidimetic hormone, insulin @Prolactin, growth hormone, luteinizing hormone c. Oxytocin, prolactin, adrenocorticotropin d. Estrogen, progesterone, testosterone 24. Which one of the following hormones elevates blood calcium? @Parathyroid hormone b. Thyroxine c. Calcitonin d. Oxytocin e. Vasopressin 25. Vitamin D a. is synthesized by skin cells. 13. becomes active after passing through the liver and kidneys. c. is lipid-soluble and thus can enter cells. d. is involved in the regulation of calcium. .11 of the above Page 4 ol' 6 26. The activation of a rhodopsin molecule sets off a chain reaction that leads to the . opening of sodium channels. d. inactivation of transducin molecules. ®closing of sodium channels. e. activation of other rhodopsin molecules. c. inactivation of phosphodiestetase molecules. 27. In the disease diabetes mellitus, a lack of insulin prevents a. the excretion of glucose. (1. the conversion of glucose to glycogen. b. glucose breakdown. e. the synthesizing of glucose. @glucose uptake by cells. 28. What kind of receptors are beta receptors for epinephrine? a. chemotropic .metabotropic b. ionotropic e. catechoiatropic c. hypophysiotropic 9. Which of the following hormones is not paired correctly with its target organ? QOxytocin --adrenal glands a. ADH —kidneys b. Prolactin — mammary glands e. Luteinizing hormone .. gonads c. Parathyroid hormone — bone 30. LH and FSH a. are produced in the hypothalamus. b. levels are increased by TSH. stimulate the production of gametes. . All of the above e. None of the above 31. The sex hormones secreted by the gonads and by the adrenal cortex are synthesized from a. complex carbohydrates. d. hemoglobin. b. amino acids. e. nucleic acids. 32. In male gametogenesis, the second meiotic divis' .11 produces four haploid a. Leydig cells. ED. . rmatids. b. primary spermatocytes. e. spermatogonia. c. secondary spermatocytes. 33. In panhenogenetic whiptail lizards, which of the following statements is TRUE? a. Both males and females reproduce asexually. b. Lizard offspring are haploid, because there is no fertilization. c. Male lizards alternate showing male sexual behaviors and female sexuai behaviors. (5) Female lizards alternate showing male sexual behaviors and female sexual behaviors. 6. Both b and d are correct- 34. The blastocyst normally implants within the a. vas deferens. d. myometrium of the vagina. b. ovarian follicle tissue. 6. chorion. @endometrium of the uterus. Page 5.- ol’ 6 35. Semen contains all of the following except a. seminal fluid from the seminal vesicles. .red blood cells. c. alkaline secretions from the prostate gland. d. hormone-like Substances called prostaglandins. e. clotting enzymes. 36. A human female has the largest number of primary oocytes in her ovaries t birth. d. midway through her fertile years. . just after puberty. e. at menopause. c. early in her fertile years. 37. In the early half of the menstrual cycle, before ovulation, which steroid hormone is at its highest level in the blood? .Estrogen d. Progesterone b. Follicle-stimulating hormone e. Testosterone c. Luteinizing hormone 38. Which one of the following sensory structures provides mammals with information about the position and orientation of the head? a. Eustachian tube d. Lateral line . Cochlea e. Tympanic membrane @emicircular canal 39. A postsynaptic cell’s processing of information from synapses at different sites is called a. excitatory p0 stsynaptic potential. {1. temporal summation. b. inhibitory postsynaptic potential. e. action potential. @patial summation. 40. When the stereoeilia of hair cells are bent, the membranes of the hair cells a. are depolarized. b. are hyperpolarized. @are either depolarized or hyperpolarized. d. generate action potentials. e. contract their stereocilia. 41. In the video on human mate choice, what were the women exposed to? a. perfumes .pheromones. c. major histooompatahility complex genes d. hombykol e. androstandione 42. Which event is the immediate trigger for ovulation and formation of the corpus luteum? a. A peak in estrogen .A peak in luteinizing hormone c. A peak in progesterone (1. Presence of sperm in the reproductive tract 6. Readiness of the endometrial lining of the uterus Page 6' of O 43. The two primary cell types of the nervous system are and . a. fibroblasts; chondrocytes d. neurons; epithelial cells .meurons; glial cells e. neuromuscular cells; epithelial cells c. epithelial cells; glandular cells 44. Which one 0fthe following is NOT a type of glial cell? adipocyte d. astrocyte b. ependymal cell c. microglial cell c. oligodendrocyte 45. injections of which of the following hormones will induce labor in a pregnant woman? a. Estrogen b. Human chorionic gonadotropin .xytocin c. Progesterone e. Prolactin 46. Long-term potentiation .may be involved in learning and memory. b. involves a decreased postsynaptic response. 0. involves AMPA receptors only. (1. results from low frequency ofstimulation. e. None of the above 47. Which of the following methods of contraception prevents the egg from entering the uterus? a. Coitus interruptus d. Diaphragm b. Condom ®Tubal ligation c. RU—486 48. Following depolarization in the action potential, the neural membrane potential is restored in most neurons when ' a. Na+ ions rush outward through the membrane. @K+ ions rush outward through the membrane. c. Cl’ ions rush inward through the membrane. (1. a pump moves ions to their original concentrations. e. the membrane becomes freely permeable to many ions. 49. Saltatory conduction results when a. continuous propagation of the nerve impulse speeds up. b. a nerve impulse jumps from one neuron to another. 0. the threshold for an action potential is suddenly increased. .action potentials spread from node to node down the axon. e. the direction of an action potential suddenly changes. 50. A male silkworm moth locates a female at a distance by @flying toward a chemical signal. b. flying toward a sound signal. c. flying toward anything shaped like a female moth. d. emitting a sound as the female approaches. e. emitting a chemical as the female approaches. ...
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