Cells

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Across
  1. 4. is a rigid covering that protects the cell, provides structural support, and gives shape to the cell.
  2. 5. is the membrane-enclosed organelle within a cell that contains the chromosomes.
  3. 7. a saclike organelle that contains enzymes which can break down materials (as food particles and waste) within a cell.
  4. 8. a microscopic single-celled organism that does not contain a distinct nucleus with a membrane nor other specialized organelles.
  5. 9. are thin (7 nm) molecules composed principally of actin protein subunits, which polymerize to form elongated actin filaments.
  6. 10. is a fluid-filled sac used for the storage of materials needed by a cell.
  7. 14. an organism consisting of a cell or cells in which the genetic material is DNA in the form of chromosomes contained within a distinct nucleus.
  8. 16. is an analytical technique used to visualize the smallest structures in matter.
  9. 19. a descriptive generalization about how some aspect of the natural world behaves under stated circumstances.
  10. 20. a short, microscopic hairlike vibrating structure found in large numbers on the surface of certain cells, either causing currents in the surrounding fluid
  11. 21. a structure found inside the nucleus of a cell. A chromosome is made up of proteins and DNA organized into genes.
  12. 23. a narrow, hollow tube-like structure found in the cytoplasm (the fluid inside a cell) of plant and animal cells.
  13. 25. a continuous membrane system that forms a series of flattened sacs within the cytoplasm of eukaryotic cells.
  14. 28. is a well-substantiated explanation of an aspect of the natural world that can incorporate laws, hypotheses, and facts.
  15. 30. a small structure in a cell that is surrounded by a membrane and has a specific function.
Down
  1. 1. the smallest unit that can live on its own and that makes up all living organisms and the tissues of the body.
  2. 2. is a double layer that encloses the cell's nucleus, where the chromosomes reside.
  3. 3. is a low-magnification stereomicroscope used especially in examining or dissecting biological specimens.
  4. 6. are plant cell organelles that convert light energy into relatively stable chemical energy via the photosynthetic process.
  5. 11. is a microscope that uses multiple lenses to enlarge the image of a sample.
  6. 12. is a microscope that uses electrons instead of light to form an image.
  7. 13. a watery, gel-like substance made of mostly salt and water that provides a structure for the cell parts so they can move freely within the cell membrane.
  8. 15. are tiny organelles that link amino acids together to form proteins, and it is the site of protein synthesis in the cell.
  9. 17. consists of a lipid bilayer that is semipermeable.
  10. 18. is responsible for transporting, modifying, and packaging proteins and lipids into vesicles for delivery to targeted destinations.
  11. 22. a mixture of DNA and proteins that form the chromosomes found in the cells of humans and other higher organisms.
  12. 24. membrane-bound cell organelles (mitochondrion, singular) that generate most of the chemical energy needed to power the cell's biochemical reactions.
  13. 26. an area inside the nucleus of a cell that is made up of RNA and proteins and is where ribosomes are made.
  14. 27. hairlike structure that acts primarily as an organelle of locomotion in the cells of many living organisms.
  15. 29. is a small circular DNA molecule found in bacteria and some other microscopic organisms.