biology vocab

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Across
  1. 4. an infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host.
  2. 5. an active plant bug of a large family that includes numerous plant pests.
  3. 10. diffusion the process of spontaneous passive transport (as opposed to active transport) of molecules or ions across a biological membrane via specific transmembrane integral proteins.
  4. 11. having a tendency to mix with, dissolve in, or be wetted by water.
  5. 12. denoting or relating to a solution having the same osmotic pressure as some other solution, especially one in a cell or a body fluid.
  6. 13. permeable allowing certain substances to pass through it but not others, especially allowing the passage of a solvent but not of certain solutes.
  7. 15. transport the movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy.
  8. 16. bilayer a two-layered arrangement of phosphate and
Down
  1. 1. cells that contain a nucleus and organelles, and are enclosed by a plasma membrane.
  2. 2. tending to repel or fail to mix with water.
  3. 3. the spreading of something more widely.
  4. 6. having a lower osmotic pressure than a particular fluid, typically a body fluid or intracellular fluid.
  5. 7. molecules that form a cell membrane, the hydrophobic lipid ends facing inward and the hydrophilic phosphate ends facing outward.
  6. 8. transport the movement of substances (as by diffusion) across a cell membrane without the expenditure of energy.
  7. 9. a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one, thus equalizing the concentrations on each side of the membrane.
  8. 11. having a higher osmotic pressure than a particular fluid, typically a body fluid or intracellular fluid.
  9. 14. membrane the semipermeable membrane surrounding the cytoplasm of a cell.
  10. 17. cells that do not have a true nucleus or membrane-bound organelles.