BIOL 1201 exam 2 Gregg Questions With Correct Answers

BIOL 1201 exam 2 Gregg Questions With
Correct Answers

Plasma membrane - CORRECT ANSWER✔✔-A selectively-permeable phospholipid
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|bilayer forming the boundary of the cells. Hydrophilic heads and hydrophobic
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tails


peripheral proteins - CORRECT ANSWER✔✔-Bound to the surface of the
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membrane


Integral proteins - CORRECT ANSWER✔✔-penetrate the hydrophobic core
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Transport proteins - CORRECT ANSWER✔✔-Span membrane. Allow passage of
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hydrophilic substances |




functions of plasma membrane - CORRECT ANSWER✔✔-transport, enzymatic
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activity, signal transduction, cell-cell recognition, intercellular joining, attachment
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to cytoskeleton and ECM. Remember that carbs in cell= cell recognition
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Permeability - CORRECT ANSWER✔✔-The easiest= small, non polar. Hardest=
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large ions |




Hydrophobic (non polar) - CORRECT ANSWER✔✔-Dissolve in lipid bilayer and
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pass through membrane
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, Hydrophilic (ions/ polar) - CORRECT ANSWER✔✔-Do not cross easily
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passive transport - CORRECT ANSWER✔✔-Diffusion of a substance with no
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energy used. Uses carrier protein. For polar and hydrophobic
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Diffusion - CORRECT ANSWER✔✔-Tendency for molecules to spread out into
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available space |




Osmosis - CORRECT ANSWER✔✔-diffusion of water across a selectively
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permeable membrane |




How does water diffuse - CORRECT ANSWER✔✔-Area of low to high until equal
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Hypotonic (we always refer to environment) - CORRECT ANSWER✔✔-Water
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rushes inside (cell bursts) normal in plant cells
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hypertonic - CORRECT ANSWER✔✔-Solution leaves cell (cell shrivels)
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Isotonic - CORRECT ANSWER✔✔-Solution is equal!
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facilitated diffusion - CORRECT ANSWER✔✔-Passive transport with help by
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proteins |




Ion channels- facilitate transport ions
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Gated channels- open/ close
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