biology terms

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Across
  1. 5. when a stop codon in the mrna enters the a cite
  2. 7. the movement of a solute from a region of high electrochemical potential on one side of the cell membrane to a region of lower electrochemical potential on the opposite side
  3. 10. a molecule composed of amino acid residues joined together by peptide bonds
  4. 13. one that has a lower concentration of solute compared to the cell
  5. 14. pairs with thymine
  6. 17. the relation between two versions of a gene
  7. 19. when the ions or molecules move across the cell membrane to a reigon of higher concentration
  8. 21. pairs with adenine
  9. 23. the central and most important part of an organism
  10. 25. any external solution that has the same water and solute concentration
  11. 30. it has a distinctive folded structure
  12. 31. the site of protein synthesis in the cell
  13. 32. a type of sugar
  14. 33. usually found in large numbers in cells and has a double membrane
  15. 34. pairs with cytosine
  16. 35. a stack of small flat sacs formed by membranes inside the cell's cytoplasm
  17. 37. the double helix that gives support to the molecule
  18. 38. the key enzyme used in transcription
  19. 39. two linked strands that wind around each other to resemble a twisted ladder
  20. 40. thymine, adenine, cytosine,and guanine
Down
  1. 1. molecules that combine to make proteins
  2. 2. having a strong affinity for water
  3. 3. associated proteins found in large numbers in the cytoplasm of living cells
  4. 4. the opening of the double helix and separation of the DNA strands
  5. 6. organisms whose cells contain a nucleus and other membrane bound organelles
  6. 8. when a cell makes proteins using the genetic information carried in rna
  7. 9. one that has a lower concentration of solute
  8. 11. water fearing
  9. 12. any organism that lacks a distinct nucleus and other organelles
  10. 15. pairs with guanine
  11. 16. the enzyme that helps dna to match bases to the original strand
  12. 18. a trait that is expressed only when genotype is homozygous
  13. 20. when a dna sequence copies to make an rna molecule
  14. 22. a external solution that has a high solute concentration and a low water concentration
  15. 24. a membrane surrounding the cytoplasm of a cell
  16. 26. any external solution that has the same solute concentration and water concentration
  17. 27. transmembrane proteins that actively move ions or solutes across biological membranes against a concentration or electrochemical gradient
  18. 28. a small sac that is formed by a membrane and filled with liquid
  19. 29. any external solution that has a high solute concentration and low water concentration
  20. 36. a plastid that contains chlorophyll and in which photosynthesis takes place