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5 Written questions

5 Matching questions

  1. stroma
  2. microfilament
  3. ribosome
  4. micrograph
  5. endoplasmic reticulum (ER)
  1. a The thinnest of the three main kinds of protein fibers making up the cytoskeleton of a eukaryotic cell; a solid, helical rod composed of the globular protein actin.
  2. b A cell structure consisting of RNA and protein organized into two subunits and functioning as the site of protein synthesis in the cytoplasm. The ribosomal subunits are constructed in the nucleolus.
  3. c The fluid of the chloroplast surrounding the thylakoid membrane; involved in the synthesis of organic molecules from carbon dioxide and water; Sugars are made in the stroma by the enzymes of the Calvin cycle.
  4. d A photograph taken through a microscope.
  5. e 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.

5 Multiple choice questions

  1. An organelle in eukaryotic cells consisting of stacks of membranous sacs that modify, store, and ship products of the endoplasmic reticulum.
  2. 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.
  3. A macromolecule consisting of one or more polypeptides linked to short chains of sugars.
  4. A substance in which the cells of an animal tissue are embedded; consists of protein and polysaccharides.
  5. A threadlike, gene-carrying structure found in the nucleus of a eukaryotic cell and most visible during mitosis and meiosis; also, the main gene-carrying structure of a prokaryotic cell. Chromosomes consist of chromatin, a combination of DNA and protein.

5 True/False questions

  1. plasma membraneThe membrane that sets a cell off from its surroundings and acts as a selective barrier to the passage of ions and molecules into and out of the cell; consists of a phospholipid bilayer in which are embedded molecules of protein and cholesterol.


  2. organelleA membrane-enclosed structure with a specialized function within a cell.


  3. nucleoid(1) An atom's central core, containing protons and neutrons. (2) The genetic control center of a eukaryotic cell.


  4. thylakoidOne of a number of disk-shaped membranous sacs inside a chloroplast. Thylakoid membranes contain chlorophyll and the enzymes of the light reactions of photosynthesis. A stack of thylakoids is called a granum.


  5. granumAn infolding of the inner membrane of a mitochondrion in which is embedded the electron transport chain and the enzyme catalyzing the synthesis of ATP.


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