biology terms

5. when a stop codon in the mrna enters the a cite
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
10. a molecule composed of amino acid residues joined together by peptide bonds
13. one that has a lower concentration of solute compared to the cell
14. pairs with thymine
17. the relation between two versions of a gene
19. when the ions or molecules move across the cell membrane to a reigon of higher concentration
21. pairs with adenine
23. the central and most important part of an organism
25. any external solution that has the same water and solute concentration
30. it has a distinctive folded structure
31. the site of protein synthesis in the cell
32. a type of sugar
33. usually found in large numbers in cells and has a double membrane
34. pairs with cytosine
35. a stack of small flat sacs formed by membranes inside the cell's cytoplasm
37. the double helix that gives support to the molecule
38. the key enzyme used in transcription
39. two linked strands that wind around each other to resemble a twisted ladder
40. thymine, adenine, cytosine,and guanine

1. molecules that combine to make proteins
2. having a strong affinity for water
3. associated proteins found in large numbers in the cytoplasm of living cells
4. the opening of the double helix and separation of the DNA strands
6. organisms whose cells contain a nucleus and other membrane bound organelles
8. when a cell makes proteins using the genetic information carried in rna
9. one that has a lower concentration of solute
11. water fearing
12. any organism that lacks a distinct nucleus and other organelles
15. pairs with guanine
16. the enzyme that helps dna to match bases to the original strand
18. a trait that is expressed only when genotype is homozygous
20. when a dna sequence copies to make an rna molecule
22. a external solution that has a high solute concentration and a low water concentration
24. a membrane surrounding the cytoplasm of a cell
26. any external solution that has the same solute concentration and water concentration
27. transmembrane proteins that actively move ions or solutes across biological membranes against a concentration or electrochemical gradient
28. a small sac that is formed by a membrane and filled with liquid
29. any external solution that has a high solute concentration and low water concentration
36. a plastid that contains chlorophyll and in which photosynthesis takes place