IN both plant and animal cells, the cell membrane
1. Produces enzymes
2. controls reproduction
3.is composed of sugars
4. regulates diffuion
http://www.biology4kids.com/files/cell_membrane.html
http://www.biologycorner.com/bio1/diffusion.html
What do you think?
1 is answer?
Did you read both sites I posted for you?
1 is not the answer.
The correct answer is 4. regulates diffusion.
To determine the correct answer, let's go through each option and see if it applies to the cell membrane in both plant and animal cells:
1. Produces enzymes: While enzymes are indeed involved in various cellular processes, the cell membrane itself does not produce enzymes. Enzymes are typically produced by other organelles within the cell, such as the endoplasmic reticulum, Golgi apparatus, or ribosomes.
2. Controls reproduction: The cell membrane is not directly responsible for controlling reproduction. Reproduction is regulated by the nucleus of the cell, which contains DNA and directs the synthesis of proteins necessary for reproduction.
3. Is composed of sugars: The cell membrane consists of a double layer of phospholipids, proteins, and cholesterol. Sugars, in the form of glycolipids and glycoproteins, can also be found on the outer surface of the cell membrane. However, sugars alone do not comprise the entire structure of the cell membrane.
4. Regulates diffusion: This is the correct answer. The cell membrane plays a crucial role in regulating the movement of substances in and out of the cell. It acts as a selectively permeable barrier, allowing certain molecules to pass through while restricting others. This selective permeability is essential for maintaining the internal cellular environment and ensuring proper functioning of the cell.
Therefore, the correct answer is 4. The cell membrane regulates diffusion.