1 point concept of osmosis (e.g., movement of water across a selectively permeable membrane (cell or cell membrane) from solution with lower solute concentration (hypotonic) to solution with higher solute concentration (hypertonic) 1 point explanation that water moves from solution with higher (more positive/less negative) water potential (ψ) to solution with lower (more negative) water potential (ψ) 1 point explanation of how water loss can cause decreased crop production (e.g., stomates close, transpiration stops, photosynthesis stops, decreased metabolism) Energy and Metabolism Short Free Response – Page 19 Cell Cycle and Heredity Short Free Response – Page 25 Molecular Genetics Short Free Response – Page 30 SIMILARITIES Synthesize DNA in 5’ to 3’ direction (DNA polymerase III can only work in 2 POINTS MAXIMUM one direction) Use RNA primers to initiate replication (primase, DNA polymerase III must 1 point for similarity, 1 have a started sequence to be functional) point for elaboration Both have RNA primers replaced with DNA (DNA polymerase I) (in parentheses) DIFFERENCES One strand is synthesized as one, continuous strand (leading strand), while 2 POINTS MAXIMUM the other is synthesized in fragments (lagging strand). Lagging strand must use ligase to connect segments of DNA, while leading 2 points for difference strand does not require use of this enzyme. including description of both strands Evolution Long Free Response – Pages 42-44
1 point concept of osmosis (e.g., movement of water across a selectively permeable membrane (cell or cell membrane) from solution with lower solute concentration (hypotonic) to solution with higher solute concentration (hypertonic) 1 point explanation that water moves from solution with higher (more positive/less negative) water potential (ψ) to solution with lower (more negative) water potential (ψ) 1 point explanation of how water loss can cause decreased crop production (e.g., stomates close, transpiration stops, photosynthesis stops, decreased metabolism) Energy and Metabolism Short Free Response – Page 19 Cell Cycle and Heredity Short Free Response – Page 25 Molecular Genetics Short Free Response – Page 30 SIMILARITIES 2 POINTS MAXIMUM 1 point for similarity, 1 point for elaboration (in parentheses) Synthesize DNA in 5’ to 3’ direction (DNA polymerase III can only work in one direction) Use RNA primers to initiate replication (primase, DNA polymerase III must have a started sequence to be functional) Both have RNA primers replaced with DNA (DNA polymerase I) DIFFERENCES 2 POINTS MAXIMUM 2 points for difference including description of both strands One strand is synthesized as one, continuous strand (leading strand), while the other is synthesized in fragments (lagging strand). Lagging strand must use ligase to connect segments of DNA, while leading strand does not require use of this enzyme. Evolution Long Free Response – Pages 42-44
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