chapter 6

• All organisms are made of cells.
  • Many organisms are single-celled.
  • Even in multicellular organisms, the cell is the basic unit of structure and function.
• The cell is the simplest collection of matter that can live.
• All cells are related by their descent from earlier cells.

The differences among the three categories of cytoskeletal elements outlined in the table above would suggest that each of the following has specialized roles. Which of the following is a correct match? (All three elements are involved in the maintenance of cell shape.)

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A) microfilaments and the nuclear lamina

B) microtubules and cleavage furrow formation

C) microfilaments and ciliary motion

D) intermediate filaments and cytoplasmic streaming

E) microtubules and chromosome movement

Which of the trees in this figure groups the domains according to similarities in cellular size and architecture?

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A) A

B) B

C) C

D) D