THE CELL
TRANSPORT INTO AND OUT OF THE CELL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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penetrate
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actively permeable
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selectively permeable
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passive transport
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Detailed explanation-1: -A membrane which allows certain substances to pass through it, but not others is called a selectively permeable membrane.
Detailed explanation-2: -The membrane is selectively permeable because substances do not cross it indiscriminately. Some molecules, such as hydrocarbons and oxygen can cross the membrane. Many large molecules (such as glucose and other sugars) cannot. Water can pass through between the lipids.
Detailed explanation-3: -Plasma membranes must allow certain substances to enter and leave a cell, while preventing harmful material from entering and essential material from leaving. In other words, plasma membranes are selectively permeable-they allow some substances through but not others.
Detailed explanation-4: -A selectively permeable membrane allows certain molecules through, but not others.