EPITHELIUM CONNECTIVE TISSUE SKIN
EPITHELIA GLANDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following is NOT true about the cell membrane?:
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it consists of two lipid bilayers
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it contains proteins for specialized functions
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it regulates entry and exit of materials
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it allows water-soluble molecules through easily
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Explanation:
Detailed explanation-1: -They are semi-permeable, which means that some molecules can diffuse across the lipid bilayer but others cannot. Small hydrophobic molecules and gases like oxygen and carbon dioxide cross membranes rapidly. Small polar molecules, such as water and ethanol, can also pass through membranes, but they do so more slowly.
Detailed explanation-2: -Final Answer: Proline is not a constituent of the cell membrane.
Detailed explanation-3: -Small uncharged molecules can diffuse freely through a phospholipid bilayer. However, the bilayer is impermeable to larger polar molecules (such as glucose and amino acids) and to ions.
There is 1 question to complete.