Cell Cycle

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Across
  1. 2. each of the two threadlike strands into which a chromosome divides longitudinally during cell division. Each contains a double helix of DNA.
  2. 4. a minute cylindrical organelle near the nucleus in animal cells, occurring in pairs and involved in the development of spindle fibers in cell division.
  3. 6. plasma membrane of the cells of plants, fungi, and bacteria. In the algae and higher plants it consists mainly of cellulose.
  4. 7. the cytoplasmic division of a cell at the end of mitosis or meiosis, bringing about the separation into two daughter cells.
  5. 11. a dense organelle present in most eukaryotic cells, typically a single rounded structure bounded by a double membrane, containing the genetic material.
  6. 12. the semipermeable membrane surrounding the cytoplasm of a cell.
  7. 13. a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth.
  8. 15. a self-replicating material that is present in nearly all living organisms as the main constituent of chromosomes. It is the carrier of genetic information.
  9. 16. the first stage of cell division during which the chromosomes become visible as paired chromatids and the nuclear envelope disappears. includes the reduction division.
  10. 18. a basic unit of heredity and a sequence of nucleotides in DNA
  11. 19. the final phase of cell division, in which the chromatids or chromosomes move to opposite ends of the cell and two nuclei are formed.
Down
  1. 1. the stage of meiotic or mitotic cell division in which the chromosomes move away from one another to opposite poles of the spindle.
  2. 3. an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. It has a double membrane, the inner layer being folded inward to form layers (cristae).
  3. 5. (in green plant cells) a plastid that contains chlorophyll and in which photosynthesis takes place.
  4. 7. the smallest unit that can live on its own and that makes up all living organisms and the tissues of the body
  5. 8. a threadlike structure of nucleic acids and protein found in the nucleus of most living cells, carrying genetic information in the form of genes.
  6. 9. the material of which the chromosomes of organisms other than bacteria (i.e., eukaryotes) are composed. It consists of protein, RNA, and DNA.
  7. 10. the resting phase between successive mitotic divisions of a cell, or between the first and second divisions of meiosis.
  8. 14. form a protein structure that divides the genetic material in a cell. necessary to equally divide the chromosomes in a parental cell into two daughter cells during both types of nuclear division: mitosis and meiosis.
  9. 17. the second stage of cell division, during which the chromosomes become attached to the spindle fibers.