ISA 2

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what is osmosis?
movement of water from a region of higher water potential to a region of lower water potential, through a partially permeable membrane
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what does isotonic mean?
when the cell is the same concentration as the surrounding solution and therefore has the same water potential
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what is the biuret test for proteins?
1.sample + equal volume of sodium hydroxide in test tube. 2.add few drops of very dilute copper (II) sulfate and gently mix. 3. purple =presence of peptide bonds (protein) remains blue = no protein
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formation of a peptide bond
Amino acids combine by peptide bonds to form dipeptides. its a condensation reaction
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primary structure
Sequence of amino acids in the polypeptide chain
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secondary structure
hydrogen bonds form between the amino acids in the chain, this makes it coil into a alpha helix or fold into a beta pleated sheet
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tertiary structure
more disulfide, ionic and hydrogen bonds form between different parts of the polypeptide chain, forming their final structure
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quaternary structure
Way that two or more polypeptide chains are assembled together. final 3D structure of proteins
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what are the fundamental differences between plant and animal cells?
plants have.....1) cell wall 2)chlorophyll and chloroplasts 3) vacuole
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cell wall
for strength and rigidity- thick outer layer
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chloroplasts
enclosed by double membranes, where photosynthesis takes place
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structure of a palisade leaf cell as seen by an optical microscope
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amino acid structure
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Other cards in this set

Card 2

Front

what does isotonic mean?

Back

when the cell is the same concentration as the surrounding solution and therefore has the same water potential

Card 3

Front

what is the biuret test for proteins?

Back

Preview of the front of card 3

Card 4

Front

formation of a peptide bond

Back

Preview of the front of card 4

Card 5

Front

primary structure

Back

Preview of the front of card 5
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