CELL STRUCTURES AND FUNCTION
CELL STRUCTURE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
All thing can enter.
|
|
|
Nothing can enter.
|
|
|
Some things can, others can’t enter.
|
|
|
None of the above
|
Detailed explanation-1: -The cell membrane is called selectively permeable as it only allows specific molecules to pass. Only specific molecules like water and gaseous molecules can pass through the cell membrane directly.
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. Ions such as H+ or Na+ cannot.
Detailed explanation-3: -The cell membrane is selectively permeable, meaning it only lets certain things in and out of the cell.
Detailed explanation-4: -The plasma membrane is called as selectively permeable membrane because it regulates the movement of substances in and out of the cell. It means that the plasma membrane allows some material to pass through it while at the same time it blocks other material from entering through it.