Biology Exam 2.1

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Across
  1. 3. G1 growth then S phase - DNA replication occurs, G2 phase growth
  2. 5. what are the 2 stages in which gene expression occurs?
  3. 6. during mitosis the pulling of sister chromatids to opposite ends of cell
  4. 7. growth & development, cell replacement, heal wounds
  5. 9. how many amino acids are essential?
  6. 10. during mitosis - finish separating, identical sets of chromosomes reach each pole, spindle goes away, nuclear membrane forms around each set of chromosomes
  7. 11. preparatory phase, interphase, mitosis, cytokinesis
  8. 12. comes from the cytoskelton & guides the separation of sister chromatids during mitosis
  9. 14. What does the shape of the protein determine?
  10. 17. different versions of the same gene; when genes differ
  11. 18. macro molecule made of repeating amino acid subunits
  12. 20. a disease of the cell cycle, cells divide inappropriately & accumulate in some instances causing a tumor
  13. 23. cytoplasm & nuclei divide into 2 daughter cells
  14. 24. how many different amino acids are there?
  15. 25. a region of DNA that codes for a protein that contains instructions to build at least one protein.
Down
  1. 1. copy cell contents, each new cell has same amount as original cell
  2. 2. a change in the DNA sequence of a gene that can change the corresponding amino acid sequence
  3. 4. tells you the amino acid sequence
  4. 8. building blocks of protein
  5. 13. converting RMA to sequence of amino acids to make a protein
  6. 15. cells produce molecules of messenger RNA (mRNA) from the instructions encoded within genes in DNA
  7. 16. enlarged cell splits into 2 cells, each has full complement of DNA, one parent cell into 2 daughter cells
  8. 19. synthesis of a protein form a gene (a gene being produced);
  9. 21. genetically engineered gene
  10. 22. animals that have been genetically altered