Biology Terms and Concepts

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Diffusion

Back

When a substance spreads out evenly throughout a medium and can cross a membrane.

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Membrane

Back

Porous barrier.

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Molecule

Back

More than one atom bonded together.

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Permeable

Back

How easy or difficult it is to cross a membrane.

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Selectively permeable

Back

To allow some substances and not others to cross a membrane.

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Dissolve

Back

To have the individual parts of a compound separate in solution.

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Homogenous

Back

To spread out evenly in a medium.

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Chemical Indicators

Back

Chemical that proves the identity of a substance.

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Glucose Indicator solution

Back

(Benedicts) A compound that proves if glucose is present.

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Starch Indicator solution

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(Iodine) A substance that proves if starch is present.