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Unauthorized copying or reuse of any part of this page is illegal. 26 71. In the cellular slime molds, the aggregation of myxamoebas is initiated by (A) (B) (C) (D) (E) low light intensities high pH uptake of chloride ion secretion of cyclic AMP elevated temperature 76. Which of the following animal phyla is diploblastic, that is, exhibits only two embryonic germ layers? (A) (B) (C) (D) (E) Rotifera Mollusca Nematoda Platyhelminthes Cnidaria 72. A unicellular eukaryote that contains chlorophyll a (but no chlorophyll b), that functions as one of the major photosynthetic autotrophs in open-ocean ecosystems, and that has cell walls that contain silica is a (A) (B) (C) (D) (E) red alga green alga dinoflagellate euglenoid diatom 77. Which of the following describes members of both the Bryophyta and the Pteridophyta? (A) (B) (C) (D) (E) The absence of true roots The absence of swimming sperm The absence of meristematic growth The presence of chlorophyll The dominance of the haploid phase of the life cycle 73. Dikaryotic hyphae are a kind of fungal tissue that (A) contain two chromosomes (B) form after plasmogamy and before karyogamy (C) are only a short stage of the life cycle of the Basidiomycota (D) are not found in the Ascomycota (E) are formed by the fusion of two nuclei 74. Saprophytic fungi obtain their nutrition by (A) taking food into their gastrovascular cavity, and then digesting and absorbing it (B) making food by chemosynthesis (C) secreting digestive enzymes into the environment and then absorbing the digestive products (D) using their amoeboid cells in phagocytosis (E) forming a parasitic relationship with soil bacteria 75. An animal with a coelom, jointed appendages, and metameric segmentation would be classified in the phylum (A) (B) (C) (D) (E) Mollusca Cnidaria Platyhelminthes Arthropoda Chordata 78. In sporophytes of some mosses, a ring of peristome teeth regulates (A) (B) (C) (D) (E) sperm release spore dispersal spore germination asexual reproduction rhizoid production 79. Which of the following characterizes dicotyledonous plants? (A) (B) (C) (D) (E) Their flowers always have superior ovaries. Their seeds usually contain two embryos. Their stems have scattered vascular bundles. Their leaves usually have parallel veins. Their flowers usually have parts in multiples of four or five. 80. All of the following allow hermaphroditic animal species to avoid inbreeding EXCEPT (A) (B) (C) (D) (E) functioning as only one sex during mating releasing eggs and sperm simultaneously being protandrous being protogynous changing sex GO ON TO THE NEXT PAGE. Unauthorized copying or reuse of any part of this page is illegal. 27 81. All of the following occur during the cleavage stage of animal development EXCEPT (A) an increase in the nuclear-to-cytoplasmic ratio of the cells (B) an increase in the number of blastomeres (C) an increase in the mass of the embryo (D) an increase in the surface-to-volume ratio of the cells (E) rapid cell divisions 82. Plants that utilize photosynthesis via the...
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