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Lecture

Lecture 3

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Department
Biology
Course
BI110
Professor
Louise Dawe
Semester
Fall

Description
Biology October 28, 2013 Tonicity - Water moves o From hypotonic solution (lower concentration of solute molecules) o To hypertonic solution (higher concentrations of solute molecules) - Solutions on each side are isotonic when the concentrations is the same on both sides o No osmotic movement of water in either direction Active Membrane Transport - Active transport requires a direct or indirect input of energy derived from ATP hydrolysis - Energy required to moves substances against their concentration gradients - Depends on membrane transport proteins o Specific o Can be saturated Two Kinds of Active Transport - Primary active transport: The same protein that transports substance also hydrolyzes ATP to power the transport directly - Secondary active transport: Transport indirectly driven by ATP hydrolysis o Transport proteins do no break down ATP o Instead, use a favorable concentration gradient of substance as their energy source Primary Active Transport - Moves positively charged ions across membranes o H+ pumps (proton pumps)  Cells lining stomach
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