Although a few protozoans are multicellular, the simplest are unicellular organisms, such as amoebas, bacteria, sarcodina, cilia
tes, flagellates, and sporozoans, which can be amorphous in shape and smaller than .001 inch. Cytoplasm fills the cell membrane that en Line closes it and functions as a barrier between cells. The membrane serves as the outer tissue, (5) and any compound that may destroy the cell has to penetrate it to reach the cytoplasm, Some types of organisms are termed colonial because they represent loosely assembled groups of structurally similar and unfunctional cells. Colonial organisms maintain a symbiotic relationship within their particular environments. Unlike colonial organisms, almost all species of animals and plants are multicellular and (10) include various types of specialized or somatic cells, each with us own nucleus, genetic code, and RNA. The overall size of a multicellular body is contingent on the total number of cells that comprise it, not the size of individual cells. TI1e simples! multicellular animals are hy dras, sponges, and jellyfish, which have well-defined tissues, a cellular nucleus, and an ele ment of cell functions. Sponges have a few specialized cells but largely resemble colonial or- (15) ganisms that can readily form a new individual group. If the cells of a sponge are separated, they rejoin and continue as a newly formed colonial organism. 22. How many cells do me simplest organisms contain? (A)One (B) One hundred (C) Many (D)An unknown number 26. In line 6, the word "loosely" is closest in meaning 10 (A) lively (B) naturally (C) freely (D)feebly 23. In line 4, the phrase "outer tissue" is closest in meaning to (A) outside force (B) outlying area (C) shell (D)cell 27. In line 8, the word "symbiotic" is closest in meaning to (A) mutually dependent (B) mutually exclusive (C) mutually hostile (D) mutually resistant 24. In line 5, the word "it" refers to (A) the cell (B) anycompound (C) the membrane (D) the cytoplasm 25. It can be inferred for the passage that a cell serves as (A) a partition of organism functions (B) thesmallest colonial group (C) the smallest genetic unit 28. The author of the passage implies that large animals and plants have (A) larger cell sizes than amoebas and protozoans (B) larger quantities of protoplasm than smaller life-forms (C) stronger cellular membranes than flagellates (D) a greater number of cells than smaller life-forms (D)aflagellate reproductive 29. In line 10, the word "each" refers 10 (A) animals (B) species (C) cells (D)plants 30. According 10 the passage, sponges and jellyfish are (A) the simplest one-cell organisms (B) the simplest multicellular animals (C) tissues and cellular nuclei (D)cellular and colonial organisms 31. The author mentions all of the following EXCEPT: (A) procreative mechanisms (B) colonial organisms (C) cell contents (D)specialized cells 32. This passage would most likely he found in a textbook on which of the following subjects> (A) Genetics (B) Anatomy (C) Biology (D) Biochemist!'
