Cell theory II Select all of the following that are tenets of the cell theory. Cells are the basic unit of structure and function in all organisms. All organisms are composed of cells. All cells come from pre-existing cells and all cells are self-reproducing. All cells are less than 10 ?m in size. All cells contain membrane-bound organelles. All cells contain cell walls.
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1. The cell theory states that A. all cells have nuclei B. life begins at conception C. all life is comprised of one or more cells D. all of the above 2. Prokaryotes differ from eukaryotes in the following manner: A. prokaryotes have circular DNA; eukaryotes have linear DNA B. prokaryotes have nuclei; eukaryotes lack nuclei C. prokaryotes lack ribosomes; eukaryotes have ribosomes D. prokaryotes lack cell membranes; eukaryotes have cell membranes 3. Apoptosis, pronounced apo-toe-sis, results in A. cells without nuclei B. cell death C. webbed fingers and/or toes D. supernormal number of fingers and toes 4. The human body has about __________ different cell types. A. 100 B. 200 C. 300 D. 500 5. Plant cells are unlike animal cells because A. they lack an endoplasmic reticulum B. they possess Golgi bodies C. lack spindle fibers D. they possess plasmodesmata
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Which of the following is not one of the main components of cell theory? A. A cell must contain DNA. B. All living things are made of cells. C. Cells can only come from other cells. D. Cells are the unit of life.
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The cell theory states that a. all living things are composed of cells. b. cells are the smallest units of living organisms. c. new cells come from pre-existing cells by cell division. d. all of the above. e. only a and b are true.
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