61. The main target organs for tropic hormones are
(A)blood vessels.
(B) endocrine glands.
(C) muscles.
(D) nerves.
(E) kidneys.

62. Which of the following characterizes parthenogenesis? (A) An egg develops without being fertilized. (B) An individual may change its sex during its lifetime. (C)Specialized groups of cells be relessed and grow into sew individualssia (D) An organism is first a male and then a female. (E) Both members of a mating pair have male and female reproductive organs.

63. Which of the following male and fenale structures are loest allone line (A) Leydig cells of testes...follicells of ovaries (B) testes_ovaries (C)seminiferous tubules_vagina (D)spermatogonia_oogonia (E) vas deferens-oviduct

64. Fertilization of human eggs most often takes place in the (A) vas deferens. (B) ovary. (C) vagina. (D) oviduct (fallopian tube). (E) uterus.

65. Which of the following is common to both avian and mammalian development? (A) gray crescent (B) epiblast and hypoblast (C) holoblastic cleavage (D) trophoblast (E) yolk plug

66. In a frog embryo, the blastocoel is (A) the cavity that becomes the coelom. (B) lined with endoderm during gastrulation. (C)completely obliterated by yolk platelets. (D) located primarily in the animal hemisphere. (E) the cavity that later forms the archenteron.

67. In the early development of an amphibian embryo, an important "organizer" is the (A)dorsal lip of the blastopore. (B) notochord. (C) neural tube. (D) dorsal ectoderm. (E) archenteron roof.

68. Receptor sites for neurotransmitters are located on the (A) tips of axons. (B) axon membranes in the regions of the nodes of Ranvier. (C) membranes of synaplic vesicles. (D) presynaptic membrane. (E) postsynaptic membrane.

69. Of the following components of the nervous system, which is the most inclusiusive? (A)central nervous system (B) neuron (C)brain (D)spinal cord (E) gray matter

70. Action potentials are usually propagated in only one direction along an axon because(A)ions can flow along the axon only in one direction.(B) the brief refractory period prevents opening of voltage-gated Na+ channels.(C)the nodes of Ranvier conduct only in one direction.(D) the axon hillock has a higher membrane potential than the tips of the axon.(E) both sodium and potassium vollage-gated channels open in one direction.

71. Some sharks close their eyes just before they bite. Although they cannot see their prey, their bites are on target. Researchers have noted that sharks often misdirect their bites at metal objects, and they can find batteries buried under the sand of an aquarium. This evidence suggests that sharks keep track of their prey during the split second before they bite in the same way that (A) a male silkworm moth locates a mate. (B) a platypus locates its prey in a muddy river. (C) a bat can find moths in the dark. (D) a Natworm avoids light places. (E) a rattlesnake finds a mouse in its burrow.

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