Briefly describe the similarities and differences between cilia and flagella
What will be an ideal response?
Both are slender extensions of the cell membrane. Flagella are longer than cilia and usually fewer in number. Both are made from an array of microtubules, and both arise from centrioles that move to the plasma membrane to form basal bodies. Cilia provide a force that is parallel to the plasma membrane. They function in moving substances across the surface of the cell and sometimes in movement of the entire cell. Flagella exert a force perpendicular to the plasma membrane and are involved in movement of the entire cell.
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Members of the genus Rhizobium
A. infect broad-leaved plants and cause crown gall disease. B. are important nitrifying bacteria that convert nitrite to nitrate. C. are free living soil bacteria that fix nitrogen. D. grow symbiotically in root nodules of legumes where they fix nitrogen.
Which is NOT a cell or fiber type found in loose connective tissues?
A. macrophages B. mast cells C. adipose cells D. collagen fibers E. chondrocytes
Small and short-lived plants that rapidly colonize disturbed sites are classified by J. Phillip Grime as
A) C species. B) R species. C) S species. D) X species.
Who disproved the "broth-to-microorganisms" hypothesis?
A) Sidney Altman B) Louis Pasteur C) Stanley Miller D) Alexander Oparin E) Francisco Redi