- animals Usually, this occurs following conjugation, after which a new macronucleus is generated from the post-conjugal micronucleus.[14]. The genus Entamoeba includes commensal or parasitic species, including the medically important E. histolytica, which is transmitted by cysts in feces and is the primary cause of amoebic dysentery. Macronuclear DNA is derived from micronuclear DNA by amazingly extensive DNA rearrangement and amplification. Humans are multi cellular organisms. However, they can also exchange genetic material by joining to exchange DNA in a process called conjugation. B) coenocytes. Although the majority of protists are unicellular, some are multicellular organisms. Protozoa, on the other hand, are nonphotosynthetic, motile organisms that are always unicellular. (a) The cellular slime mold Dictyostelium discoideum can be grown on agar in a Petri dish. D) Paramecium and Foraminifera (credit: modification of work by Kouassi RYW, McGraw SW, Yao PK, Abou-Bacar A, Brunet J, Pesson B, Bonfoh B, Ngoran EK & Candolfi E). The primitively multicellular aggregation consists of individual cells that each have their own nucleus. With the emergence of molecular phylogenetics and tools enabling researchers to directly compare the DNA of different organisms, it became evident that, of the main sub-groups of Protozoa, only the ciliates (Ciliophora) formed a natural group, or monophyletic clade, once a few extraneous members (such as Stephanopogon or protociliates and Biology - Unit 5 - The Little Critters Flashcards | Quizlet E) Meiosis has the same number of stages as mitosis. When the following solutions are mixed together, what precipitate (if any) will form? B. What characteristics might make you think a protist could be pathogenic? What are the groups found under archaeplastida? A. budding of the plastids from the nuclear envelope E) late metaphase and early telophase, When mitosis occurs without cytokinesis, which of the following is produced? D) a tetrad A) green algae Finally, Toxoplasma gondii causes toxoplasmosis and can be transmitted from cat feces, unwashed fruit and vegetables, or from undercooked meat. One example of a coevolutionary arms race is when faster deer evolve and favor wolves and cougars that have stronger eyesight and senses of smell. Do red algae live on terrestrial land or marine? Inside this layer is a sol (fluid) region of cytoplasm called the endoplasm. Most are saprobes. Algae can have different types of photosynthetic pigments that allow them to photosynthesize at various depths in water. B) anaphase As part of this mandate, the CDC has officially identified five parasitic diseases it considers to have been neglected (i.e., not adequately studied). 3) rhizarians. D) macronuclei \hline \text{Dip} & & & & \\ Although the cilia may be used for locomotion, they are often used for feeding, as well, and some forms are nonmotile. The genus Leishmania includes trypanosomes that cause disfiguring skin disease and sometimes systemic illness as well. E) thalli, Which of the following protozoan genera helps termites digest wood? Ticks, lice, and mosquitoes often serve as ________ by carrying and transmitting pathogenic microbes, Ch. He keeps scratching at it, drawing the attention of hisparents.
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