How do molecules compare in size with biological structures such as cells, organelles, bacteria, and viruses?

Accept all responses and write them on the board. Students will explore these size relationships in the next steps. Tell students that they will now investigate the relative sizes of different biological structures and see how close their estimates of relative size were.

€¢ Give each student a copy of Master 1.1, Searching for Scale. Work with the class to complete column 3, Size relative to cell. More.

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