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5 Written questions

5 Matching questions

  1. peroxisome
  2. chloroplast
  3. intermediate filament
  4. nucleolus
  5. centriole
  1. a An intermediate-sized protein fiber that is one of the three main kinds of fibers making up the cytoskeleton of eukaryotic cells. Intermediate filaments are ropelike, made of fibrous proteins.
  2. b 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.
  3. c An organelle containing enzymes that transfer hydrogen from various substrates to oxygen, producing and then degrading hydrogen peroxide.
  4. d An organelle found in plants and photosynthetic protists that absorbs sunlight and uses it to drive the synthesis of organic molecules (sugars) from carbon dioxide and water.
  5. e A structure within the nucleus of a eukaryotic cell where ribosomal RNA is made and assembled with proteins imported from the cytoplasm to make ribosomal subunits.

5 Multiple choice questions

  1. Everything inside a cell between the plasma membrane and the nucleus; consists of a semifluid medium and organelles.
  2. A tiny membranous sac in a cell's cytoplasm carrying molecules produced by the cell. The vesicle buds from the endoplasmic reticulum or Golgi and eventually fuses with another membranous organelle or the plasma membrane, releasing its contents.
  3. A microscope that uses an electron beam to study the internal structure of thinly sectioned specimens.
  4. A membrane-enclosed structure with a specialized function within a cell.
  5. A sac made of membrane in the cytoplasm of a eukaryotic cell.

5 True/False questions

  1. cell theoryA protective layer external to the plasma membrane in plant cells, bacteria, fungi, and some protists; protects the cell and helps maintain its shape.


  2. Reverse TranscriptaseA membrane-enclosed sac occupying most of the interior of a mature plant cell, having diverse roles in reproduction, growth, and development.


  3. electron microscope (EM)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.


  4. cytoskeletonEverything inside a cell between the plasma membrane and the nucleus; consists of a semifluid medium and organelles.


  5. scanning electron microscope (SEM)An instrument that focuses an electron beam through, or onto the surface of, a specimen. An electron microscope achieves a hundredfold greater resolution than a light microscope.


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