Plasma membrane (parts and function)

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Parts and function of cell membrane (by Noor Elgamal& Nour Tawfik)

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NRMAZ EL

Egypt

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Plasma membrane (parts and function)Version en ligne Parts and function of cell membrane (by Noor Elgamal& Nour Tawfik) par NRMAZ EL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Explanation 1 Glycoproteins → they act as markers for cell recognition and signaling 2 Cholesterol → It stabilizes the membrane and reduces fluidity at high temperatures. 3 Phospholipid bilayer → It regulates selective permeability and water balance. 7 Right! Lipids form the main barrier and energy reserve. 8 Correct! Cholesterol stabilizes the membrane and adjusts fluidity. 9 Correct answer:B A) A double layer of proteins ❌ Proteins are part of the membrane but are not the main layer. B) A double layer of lipids ✅ The membrane is mainly made of two layers of phospholipids, with hydrophilic heads and hydrophobic tails. C) A single layer of carbohydrates ❌ Carbohydrates are only on the surface as markers, not a main layer. D) A network of DNA ❌ DNA is in the nucleus, not in the plasma membrane. 11 Correct answer:B A) Diffuse freely ❌ Ions cannot cross freely because they are hydrophilic. B) Through channel or carrier proteins ✅ Ions cross via specific channels or carrier proteins. C) By dissolving in lipids ❌ Ions cannot dissolve in lipids, so they can’t pass this way. D) By osmosis ❌ Osmosis moves water, not ions. 12 Correct answer:B A) Transport ions ❌ Ion transport is done by proteins, not cholesterol. B) Maintain membrane fluidity ✅ Cholesterol regulates membrane fluidity, preventing it from being too rigid or too fluid. C) Synthesize proteins ❌ Protein synthesis occurs in ribosomes, not by cholesterol. D) Store energy ❌ Cholesterol is not used to store energy. 14 Correct answer:Cell membrane or plasma membrane The modification of the cell membrane results in formation of specialized structures like axon of nerves, microvilli of intestinal epithelium and tail of spermatids. 16 Peripheral protien 19 Correct! Phospholipid bilayer controls what enters and exits. 20 Right! Cholesterol balances fluidity and rigidity.

Plasma membrane (parts and function)Version en ligne

Parts and function of cell membrane (by Noor Elgamal& Nour Tawfik)

par NRMAZ EL

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Explanation

Glycoproteins → they act as markers for cell recognition and signaling

Cholesterol → It stabilizes the membrane and reduces fluidity at high temperatures.

Phospholipid bilayer → It regulates selective permeability and water balance.

Right! Lipids form the main barrier and energy reserve.

Correct! Cholesterol stabilizes the membrane and adjusts fluidity.

Correct answer:B A) A double layer of proteins ❌ Proteins are part of the membrane but are not the main layer. B) A double layer of lipids ✅ The membrane is mainly made of two layers of phospholipids, with hydrophilic heads and hydrophobic tails. C) A single layer of carbohydrates ❌ Carbohydrates are only on the surface as markers, not a main layer. D) A network of DNA ❌ DNA is in the nucleus, not in the plasma membrane.

Correct answer:B A) Diffuse freely ❌ Ions cannot cross freely because they are hydrophilic. B) Through channel or carrier proteins ✅ Ions cross via specific channels or carrier proteins. C) By dissolving in lipids ❌ Ions cannot dissolve in lipids, so they can’t pass this way. D) By osmosis ❌ Osmosis moves water, not ions.

Correct answer:B A) Transport ions ❌ Ion transport is done by proteins, not cholesterol. B) Maintain membrane fluidity ✅ Cholesterol regulates membrane fluidity, preventing it from being too rigid or too fluid. C) Synthesize proteins ❌ Protein synthesis occurs in ribosomes, not by cholesterol. D) Store energy ❌ Cholesterol is not used to store energy.

Correct answer:Cell membrane or plasma membrane The modification of the cell membrane results in formation of specialized structures like axon of nerves, microvilli of intestinal epithelium and tail of spermatids.

Peripheral protien

Correct! Phospholipid bilayer controls what enters and exits.

Right! Cholesterol balances fluidity and rigidity.

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Plasma membrane (parts and function)

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