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Question
Biology
Posted 8 months ago
Which structures is
(are)
 not present in the cell membrane?
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Answer from Sia
Posted 8 months ago
Answer
Proteins, lipids, and carbohydrates are present in the cell membrane, but structures like ribosomes, mitochondria, and the nucleus are not.
Solution
a
Ribosomes: These are the sites of protein synthesis and are found in the cytoplasm or attached to the endoplasmic reticulum, not in the cell membrane
b
Mitochondria: These are the powerhouses of the cell, responsible for energy production, and are located in the cytoplasm, not in the cell membrane
c
Nucleus: This is the control center of the cell, containing genetic material, and is found in the cytoplasm, not in the cell membrane
Key Concept
The cell membrane is composed of a lipid bilayer with embedded proteins and carbohydrates, but it does not contain organelles like ribosomes, mitochondria, or the nucleus.
Explanation
The cell membrane's primary function is to regulate the movement of substances in and out of the cell, and it is structurally composed of lipids, proteins, and carbohydrates. Organelles such as ribosomes, mitochondria, and the nucleus are located within the cytoplasm and are not part of the cell membrane.

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