2 Which one among the following describes the function of the plasma membrane? a

Question

2 Which one among the following describes the function of the plasma membrane? a )The plasma membrane separates the cell from its external environment b) The plasma membrane encloses cellular contents. c) The plasma membrane controls the movement of molecules from one side of the cell to the other d) All of the above are functions of the plasma membrane. 3. The plasma membrane is selectively permeable. This means that a) only gasses and water can pass through it. b) Only ions and water can enter the cell c) Only certain substances can pass into or out of the cell. d) All substances need carrier molecules to pass through it 4. 0.9% NaCl solution (saline ) is isotonic to a cell , while 25% dextrose is a) hypertonic to cell b) isotonic to cell c) hypotonic to cel d) all of the above 5. Which of the following will increase the rate of diffusion ? a) increase viscocity of the solution b) increase molecular weight of the diffusing particle c) decrease concentration gradient d) increase temperature 6. Which of the following is a non membranous organells a) a mitochondria b) the rough endoplasmic reticulum c) a centriole d) a lysosome

Explanation / Answer

2- The correct answer is option D that is all of the above mentioned are the function of to plasma membrane.

3 - The correct answer is option C that is selectively permeable means only certain molecules can pass into or out of the cell

4 - The correct answer is option A that is hypertonic to the cell because it more concentrated than the 0.9% NaCl.

5 - The correct answer is option D that is increase temperature because it will increase the rate of diffusion.

6 The correct answer is option C that is a centriole as it is a non membranous organelle. Rest are the membranous organelle.

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