← Biology Chapter 4 Test
5 Written Questions
5 Matching Questions
- transmission electron microscope
- endoplasmic reticulum (ER)
- a An open channel in a plant cell wall through which strands of cytoplasm connect from adjacent cells.
- b A microscope that uses an electron beam to study the internal structure of thinly sectioned specimens.
- c A membrane-enclosed structure with a specialized function within a cell.
- d An extensive membranous network in a eukaryotic cell, continuous with the outer nuclear membrane and composed of ribosome-studded (rough) and ribosome-free (smooth) regions.
- e An organelle containing enzymes that transfer hydrogen from various substrates to oxygen, producing and then degrading hydrogen peroxide.
5 Multiple Choice Questions
- The theory that all living things are composed of cells and that all cells come from other cells.
- A structure in an animal cell composed of cylinders of microtubule triplets arranged in a 9 and 0 pattern. An animal usually has a centrosome with a pair of centrioles involved in cell division.
- A membrane-enclosed sac that is part of the endomembrane system of a eukaryotic cell, having diverse functions.
- A substance in which the cells of an animal tissue are embedded; consists of protein and polysaccharides.
- An optical instrument with lenses that refract (bend) visible light to magnify images and project them into a viewer's eye or onto photographic film.
5 True/False Questions
endosymbiosis → The complex of DNA and proteins that constitutes eukaryotic chromosomes; often used to refer to the diffuse, very extended form taken by chromosomes when a cell is not dividing.
nucleolus → (1) An atom's central core, containing protons and neutrons. (2) The genetic control center of a eukaryotic cell.
cytoskeleton → Everything inside a cell between the plasma membrane and the nucleus; consists of a semifluid medium and organelles.
flagellum → A long cellular appendage specialized for locomotion. The flagella of prokaryotes and eukaryotes differ in both structure and function. Like cilia, eukaryotic flagella have a 9 + 2 arrangement of microtubules covered by the cell's plasma membrane.
scanning electron microscope (SEM) → A microscope that uses an electron beam to study the surface architecture of a cell or other specimen.