Mammalian respiration is described as "negative pressure breathing" because intra-alveolar pressure is negative during both inspiration and expiration.
question:
Mammalian respiration is described as "negative pressure breathing" because intra-alveolar pressure is negative during both inspiration and expiration.
answer should clearly state whether or not the statement is correct and then concisely explain why. the answer should be like more than three but less than 5 sentences and address all of the points in the statement.
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Both transmembrane carrier proteins and transmembrane channel proteins can mediate active transport of a hydrophilic solute through a cell plasma membrane.
This statement is incorrect. Movement of a solute through a channel protein is always passive, whereas carrier-mediated transmembrane transport can be either passive or active. A transmembrane channel protein creates a pore through the membrane allowing for simple diffusion of a hydrophilic solute down a concentration gradient through the membrane. In contrast, transmembrane carrier protein interacts with and 'escorts' a hydrophilic solute through the membrane and is capable of transporting a solute against a concentration gradient.
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