169076
The property of semi permeability belongs to
1 cell wall
2 plasma membrane
3 mitochondria only
4 none of the above
Explanation:
B The cell membrane or the plasma membrane is the outer membrane present in all cells which separates the inside content of the cell from the external surroundings. - It is semi-permeable in nature. - A semipermeable membrane is a membrane that allows certain molecules or ions to pass through it by diffusion and occasionally specialized "facilitated diffusion" and prevents the entry or movement of other materials.
AIIMS-2011
Cell : Structure and Functions
169077
What are Singer and Nicolson known for?
1 One-gene-one-enzyme hypothesis
2 Plasma membrane modifications
3 Fluid-mosaic model of plasma membrane
4 Structure of DNA
Explanation:
C Fluid mosaic model which was proposed by singer and Nicolson in 1972. - According to this model, the membrane does not have a uniform disposition of lipids and proteins. The phospholipid bilayer of plasma membrane is viscous and individual phospholipids can move position. The phospholipid bilayer is embedded with proteins, resulting in a mosaic of components.
AIIMS-2010
Cell : Structure and Functions
169079
Addition of new cell wall particles amongst the existing ones is:
1 Deposition
2 Apposition
3 Intussusception
4 Aggregation
Explanation:
C Growth of cell wall involve the growth in surface area as well as growth in thickness. It occurs by two methods - (1) Intussusception :- Intussusception is development or growth by the deposition of new materials between existing components of cell wall. Intussusception also involve cell elongation. (2) Apposition :- Apposition is the addition of layers of cellulose to the inner surface of a plant cell wall, at its junction with the plasma membrane.
AIPMT-1991
Cell : Structure and Functions
169083
Which of the following enzymes helps in crossing plasma membrane?
1 protease
2 pepsin
3 dehydrogenase
4 permease
Explanation:
D The permease is an enzyme that facilitates diffusion of specific molecules across the plasma membrane passively and it increases the membrane porosity to support easy transport of the molecules and functions as an integral part of intercellular transport. Pepsin is an aspartic protease using a catalytic as partate in its active site. Protein is enzymes that break down protein. Dehydrogenase is an enzyme belongs to class oxidoreductase act as catalyst.
169076
The property of semi permeability belongs to
1 cell wall
2 plasma membrane
3 mitochondria only
4 none of the above
Explanation:
B The cell membrane or the plasma membrane is the outer membrane present in all cells which separates the inside content of the cell from the external surroundings. - It is semi-permeable in nature. - A semipermeable membrane is a membrane that allows certain molecules or ions to pass through it by diffusion and occasionally specialized "facilitated diffusion" and prevents the entry or movement of other materials.
AIIMS-2011
Cell : Structure and Functions
169077
What are Singer and Nicolson known for?
1 One-gene-one-enzyme hypothesis
2 Plasma membrane modifications
3 Fluid-mosaic model of plasma membrane
4 Structure of DNA
Explanation:
C Fluid mosaic model which was proposed by singer and Nicolson in 1972. - According to this model, the membrane does not have a uniform disposition of lipids and proteins. The phospholipid bilayer of plasma membrane is viscous and individual phospholipids can move position. The phospholipid bilayer is embedded with proteins, resulting in a mosaic of components.
AIIMS-2010
Cell : Structure and Functions
169079
Addition of new cell wall particles amongst the existing ones is:
1 Deposition
2 Apposition
3 Intussusception
4 Aggregation
Explanation:
C Growth of cell wall involve the growth in surface area as well as growth in thickness. It occurs by two methods - (1) Intussusception :- Intussusception is development or growth by the deposition of new materials between existing components of cell wall. Intussusception also involve cell elongation. (2) Apposition :- Apposition is the addition of layers of cellulose to the inner surface of a plant cell wall, at its junction with the plasma membrane.
AIPMT-1991
Cell : Structure and Functions
169083
Which of the following enzymes helps in crossing plasma membrane?
1 protease
2 pepsin
3 dehydrogenase
4 permease
Explanation:
D The permease is an enzyme that facilitates diffusion of specific molecules across the plasma membrane passively and it increases the membrane porosity to support easy transport of the molecules and functions as an integral part of intercellular transport. Pepsin is an aspartic protease using a catalytic as partate in its active site. Protein is enzymes that break down protein. Dehydrogenase is an enzyme belongs to class oxidoreductase act as catalyst.
169076
The property of semi permeability belongs to
1 cell wall
2 plasma membrane
3 mitochondria only
4 none of the above
Explanation:
B The cell membrane or the plasma membrane is the outer membrane present in all cells which separates the inside content of the cell from the external surroundings. - It is semi-permeable in nature. - A semipermeable membrane is a membrane that allows certain molecules or ions to pass through it by diffusion and occasionally specialized "facilitated diffusion" and prevents the entry or movement of other materials.
AIIMS-2011
Cell : Structure and Functions
169077
What are Singer and Nicolson known for?
1 One-gene-one-enzyme hypothesis
2 Plasma membrane modifications
3 Fluid-mosaic model of plasma membrane
4 Structure of DNA
Explanation:
C Fluid mosaic model which was proposed by singer and Nicolson in 1972. - According to this model, the membrane does not have a uniform disposition of lipids and proteins. The phospholipid bilayer of plasma membrane is viscous and individual phospholipids can move position. The phospholipid bilayer is embedded with proteins, resulting in a mosaic of components.
AIIMS-2010
Cell : Structure and Functions
169079
Addition of new cell wall particles amongst the existing ones is:
1 Deposition
2 Apposition
3 Intussusception
4 Aggregation
Explanation:
C Growth of cell wall involve the growth in surface area as well as growth in thickness. It occurs by two methods - (1) Intussusception :- Intussusception is development or growth by the deposition of new materials between existing components of cell wall. Intussusception also involve cell elongation. (2) Apposition :- Apposition is the addition of layers of cellulose to the inner surface of a plant cell wall, at its junction with the plasma membrane.
AIPMT-1991
Cell : Structure and Functions
169083
Which of the following enzymes helps in crossing plasma membrane?
1 protease
2 pepsin
3 dehydrogenase
4 permease
Explanation:
D The permease is an enzyme that facilitates diffusion of specific molecules across the plasma membrane passively and it increases the membrane porosity to support easy transport of the molecules and functions as an integral part of intercellular transport. Pepsin is an aspartic protease using a catalytic as partate in its active site. Protein is enzymes that break down protein. Dehydrogenase is an enzyme belongs to class oxidoreductase act as catalyst.
NEET Test Series from KOTA - 10 Papers In MS WORD
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Cell : Structure and Functions
169076
The property of semi permeability belongs to
1 cell wall
2 plasma membrane
3 mitochondria only
4 none of the above
Explanation:
B The cell membrane or the plasma membrane is the outer membrane present in all cells which separates the inside content of the cell from the external surroundings. - It is semi-permeable in nature. - A semipermeable membrane is a membrane that allows certain molecules or ions to pass through it by diffusion and occasionally specialized "facilitated diffusion" and prevents the entry or movement of other materials.
AIIMS-2011
Cell : Structure and Functions
169077
What are Singer and Nicolson known for?
1 One-gene-one-enzyme hypothesis
2 Plasma membrane modifications
3 Fluid-mosaic model of plasma membrane
4 Structure of DNA
Explanation:
C Fluid mosaic model which was proposed by singer and Nicolson in 1972. - According to this model, the membrane does not have a uniform disposition of lipids and proteins. The phospholipid bilayer of plasma membrane is viscous and individual phospholipids can move position. The phospholipid bilayer is embedded with proteins, resulting in a mosaic of components.
AIIMS-2010
Cell : Structure and Functions
169079
Addition of new cell wall particles amongst the existing ones is:
1 Deposition
2 Apposition
3 Intussusception
4 Aggregation
Explanation:
C Growth of cell wall involve the growth in surface area as well as growth in thickness. It occurs by two methods - (1) Intussusception :- Intussusception is development or growth by the deposition of new materials between existing components of cell wall. Intussusception also involve cell elongation. (2) Apposition :- Apposition is the addition of layers of cellulose to the inner surface of a plant cell wall, at its junction with the plasma membrane.
AIPMT-1991
Cell : Structure and Functions
169083
Which of the following enzymes helps in crossing plasma membrane?
1 protease
2 pepsin
3 dehydrogenase
4 permease
Explanation:
D The permease is an enzyme that facilitates diffusion of specific molecules across the plasma membrane passively and it increases the membrane porosity to support easy transport of the molecules and functions as an integral part of intercellular transport. Pepsin is an aspartic protease using a catalytic as partate in its active site. Protein is enzymes that break down protein. Dehydrogenase is an enzyme belongs to class oxidoreductase act as catalyst.
