D Plant protoplasts are somatic plant cells without cell wall. Exposure of the naked protoplast membrane allows us to investigate more easily fundamental aspects of cell physiology and cell surface interaction with toxins and pathogens. Protoplast contains cytoplasm along with cell membrane and nucleus. Protoplasts can be generated by stripping the cell wall from plant, bacterial or fungal cells by mechanical, chemical or enzymatic means.
Uttarakhand PMT-2010
Cell : Structure and Functions
169086
Identify the correct statement about the fluid mosaic model of cell membrane.
1 It was proposed by \(\mathrm{J}\) David Robertson in 1972
2 Model resembles the iceberg (as proteins) floating in the sea (of phospholipids).
3 Hydrophilic phosphate head of phospholipids face inwards.
4 Hydrocarbon tails face out ward.
Explanation:
B Fluid model proposed by - singer and Nicolson (1972) According this model proteins molecules occurs in mosaic pattern i.e. protein Iceberg in the sea of lipid or Gulabjamun in the concentration solution of the sugar. In fluid mosaic model there is a lipid bilayer having proteins embedded in them. The protein molecules moves latterly in the lipid layer not flip-flop motion i.e. not from 1 lipid layer to the other lipid layer but lipid molecules rarely exhibit flip-flop movement.
BCECE-2015
Cell : Structure and Functions
169090
Cystoliths are composed of:
1 glucosides
2 calcium oxalate
3 calcium carbonate
4 magnesium oxalate
Explanation:
C Cystoliths are outgrowth of epidermal cell wall. They are visible as dots or variously shaped marks specially in pressed, dried leaves. They may serve as some kind of protection from leaf eating insects or other animals. Cystoliths is the crystal of calcium carbonate that is formed in special cells called as lithocytes which is present in leaf of plants as ficus elastica. It helps in the regulation of calcium level in the plants.
DUMET-2003
Cell : Structure and Functions
169091
Which of the following statements is INCORRECT regarding biological membrane?
1 It is composed of lipids and proteins
2 Peripheral proteins are loosely associated with the membrane
3 Integral proteins span the lipid bilayer
4 Lipids and membrane proteins do not provide structural and functional asymmetry
Explanation:
D Plasma membrane is asymmetric due to oligosaccharides which forms glycoprotein \& glycolipid along with proteins and the components of biological membranes are asymmetrically distributed between the membrane surface. In biological membrane protein is 2 type - Peripheral proteins, which are loosely associated with membrane, \& integral protein which is span in lipid.
KVPY SB \& SX-2016
Cell : Structure and Functions
169092
The most abundant substance of middle lemella is:
1 Suberin
2 Cutin
3 Lignin
4 Pectin
Explanation:
D Middle lamella is the part of cell wall that is the outermost layer in between cells. It is a layer that cements together the primary cell walls of two adjoining plant cells. Middle lamella is made up of calcium and magnesium pectate. Pectin present in this layer is a heteropolysaccharide which helps to bind the two cells together it also helps in cell growth and cell wall.
D Plant protoplasts are somatic plant cells without cell wall. Exposure of the naked protoplast membrane allows us to investigate more easily fundamental aspects of cell physiology and cell surface interaction with toxins and pathogens. Protoplast contains cytoplasm along with cell membrane and nucleus. Protoplasts can be generated by stripping the cell wall from plant, bacterial or fungal cells by mechanical, chemical or enzymatic means.
Uttarakhand PMT-2010
Cell : Structure and Functions
169086
Identify the correct statement about the fluid mosaic model of cell membrane.
1 It was proposed by \(\mathrm{J}\) David Robertson in 1972
2 Model resembles the iceberg (as proteins) floating in the sea (of phospholipids).
3 Hydrophilic phosphate head of phospholipids face inwards.
4 Hydrocarbon tails face out ward.
Explanation:
B Fluid model proposed by - singer and Nicolson (1972) According this model proteins molecules occurs in mosaic pattern i.e. protein Iceberg in the sea of lipid or Gulabjamun in the concentration solution of the sugar. In fluid mosaic model there is a lipid bilayer having proteins embedded in them. The protein molecules moves latterly in the lipid layer not flip-flop motion i.e. not from 1 lipid layer to the other lipid layer but lipid molecules rarely exhibit flip-flop movement.
BCECE-2015
Cell : Structure and Functions
169090
Cystoliths are composed of:
1 glucosides
2 calcium oxalate
3 calcium carbonate
4 magnesium oxalate
Explanation:
C Cystoliths are outgrowth of epidermal cell wall. They are visible as dots or variously shaped marks specially in pressed, dried leaves. They may serve as some kind of protection from leaf eating insects or other animals. Cystoliths is the crystal of calcium carbonate that is formed in special cells called as lithocytes which is present in leaf of plants as ficus elastica. It helps in the regulation of calcium level in the plants.
DUMET-2003
Cell : Structure and Functions
169091
Which of the following statements is INCORRECT regarding biological membrane?
1 It is composed of lipids and proteins
2 Peripheral proteins are loosely associated with the membrane
3 Integral proteins span the lipid bilayer
4 Lipids and membrane proteins do not provide structural and functional asymmetry
Explanation:
D Plasma membrane is asymmetric due to oligosaccharides which forms glycoprotein \& glycolipid along with proteins and the components of biological membranes are asymmetrically distributed between the membrane surface. In biological membrane protein is 2 type - Peripheral proteins, which are loosely associated with membrane, \& integral protein which is span in lipid.
KVPY SB \& SX-2016
Cell : Structure and Functions
169092
The most abundant substance of middle lemella is:
1 Suberin
2 Cutin
3 Lignin
4 Pectin
Explanation:
D Middle lamella is the part of cell wall that is the outermost layer in between cells. It is a layer that cements together the primary cell walls of two adjoining plant cells. Middle lamella is made up of calcium and magnesium pectate. Pectin present in this layer is a heteropolysaccharide which helps to bind the two cells together it also helps in cell growth and cell wall.
D Plant protoplasts are somatic plant cells without cell wall. Exposure of the naked protoplast membrane allows us to investigate more easily fundamental aspects of cell physiology and cell surface interaction with toxins and pathogens. Protoplast contains cytoplasm along with cell membrane and nucleus. Protoplasts can be generated by stripping the cell wall from plant, bacterial or fungal cells by mechanical, chemical or enzymatic means.
Uttarakhand PMT-2010
Cell : Structure and Functions
169086
Identify the correct statement about the fluid mosaic model of cell membrane.
1 It was proposed by \(\mathrm{J}\) David Robertson in 1972
2 Model resembles the iceberg (as proteins) floating in the sea (of phospholipids).
3 Hydrophilic phosphate head of phospholipids face inwards.
4 Hydrocarbon tails face out ward.
Explanation:
B Fluid model proposed by - singer and Nicolson (1972) According this model proteins molecules occurs in mosaic pattern i.e. protein Iceberg in the sea of lipid or Gulabjamun in the concentration solution of the sugar. In fluid mosaic model there is a lipid bilayer having proteins embedded in them. The protein molecules moves latterly in the lipid layer not flip-flop motion i.e. not from 1 lipid layer to the other lipid layer but lipid molecules rarely exhibit flip-flop movement.
BCECE-2015
Cell : Structure and Functions
169090
Cystoliths are composed of:
1 glucosides
2 calcium oxalate
3 calcium carbonate
4 magnesium oxalate
Explanation:
C Cystoliths are outgrowth of epidermal cell wall. They are visible as dots or variously shaped marks specially in pressed, dried leaves. They may serve as some kind of protection from leaf eating insects or other animals. Cystoliths is the crystal of calcium carbonate that is formed in special cells called as lithocytes which is present in leaf of plants as ficus elastica. It helps in the regulation of calcium level in the plants.
DUMET-2003
Cell : Structure and Functions
169091
Which of the following statements is INCORRECT regarding biological membrane?
1 It is composed of lipids and proteins
2 Peripheral proteins are loosely associated with the membrane
3 Integral proteins span the lipid bilayer
4 Lipids and membrane proteins do not provide structural and functional asymmetry
Explanation:
D Plasma membrane is asymmetric due to oligosaccharides which forms glycoprotein \& glycolipid along with proteins and the components of biological membranes are asymmetrically distributed between the membrane surface. In biological membrane protein is 2 type - Peripheral proteins, which are loosely associated with membrane, \& integral protein which is span in lipid.
KVPY SB \& SX-2016
Cell : Structure and Functions
169092
The most abundant substance of middle lemella is:
1 Suberin
2 Cutin
3 Lignin
4 Pectin
Explanation:
D Middle lamella is the part of cell wall that is the outermost layer in between cells. It is a layer that cements together the primary cell walls of two adjoining plant cells. Middle lamella is made up of calcium and magnesium pectate. Pectin present in this layer is a heteropolysaccharide which helps to bind the two cells together it also helps in cell growth and cell wall.
D Plant protoplasts are somatic plant cells without cell wall. Exposure of the naked protoplast membrane allows us to investigate more easily fundamental aspects of cell physiology and cell surface interaction with toxins and pathogens. Protoplast contains cytoplasm along with cell membrane and nucleus. Protoplasts can be generated by stripping the cell wall from plant, bacterial or fungal cells by mechanical, chemical or enzymatic means.
Uttarakhand PMT-2010
Cell : Structure and Functions
169086
Identify the correct statement about the fluid mosaic model of cell membrane.
1 It was proposed by \(\mathrm{J}\) David Robertson in 1972
2 Model resembles the iceberg (as proteins) floating in the sea (of phospholipids).
3 Hydrophilic phosphate head of phospholipids face inwards.
4 Hydrocarbon tails face out ward.
Explanation:
B Fluid model proposed by - singer and Nicolson (1972) According this model proteins molecules occurs in mosaic pattern i.e. protein Iceberg in the sea of lipid or Gulabjamun in the concentration solution of the sugar. In fluid mosaic model there is a lipid bilayer having proteins embedded in them. The protein molecules moves latterly in the lipid layer not flip-flop motion i.e. not from 1 lipid layer to the other lipid layer but lipid molecules rarely exhibit flip-flop movement.
BCECE-2015
Cell : Structure and Functions
169090
Cystoliths are composed of:
1 glucosides
2 calcium oxalate
3 calcium carbonate
4 magnesium oxalate
Explanation:
C Cystoliths are outgrowth of epidermal cell wall. They are visible as dots or variously shaped marks specially in pressed, dried leaves. They may serve as some kind of protection from leaf eating insects or other animals. Cystoliths is the crystal of calcium carbonate that is formed in special cells called as lithocytes which is present in leaf of plants as ficus elastica. It helps in the regulation of calcium level in the plants.
DUMET-2003
Cell : Structure and Functions
169091
Which of the following statements is INCORRECT regarding biological membrane?
1 It is composed of lipids and proteins
2 Peripheral proteins are loosely associated with the membrane
3 Integral proteins span the lipid bilayer
4 Lipids and membrane proteins do not provide structural and functional asymmetry
Explanation:
D Plasma membrane is asymmetric due to oligosaccharides which forms glycoprotein \& glycolipid along with proteins and the components of biological membranes are asymmetrically distributed between the membrane surface. In biological membrane protein is 2 type - Peripheral proteins, which are loosely associated with membrane, \& integral protein which is span in lipid.
KVPY SB \& SX-2016
Cell : Structure and Functions
169092
The most abundant substance of middle lemella is:
1 Suberin
2 Cutin
3 Lignin
4 Pectin
Explanation:
D Middle lamella is the part of cell wall that is the outermost layer in between cells. It is a layer that cements together the primary cell walls of two adjoining plant cells. Middle lamella is made up of calcium and magnesium pectate. Pectin present in this layer is a heteropolysaccharide which helps to bind the two cells together it also helps in cell growth and cell wall.
D Plant protoplasts are somatic plant cells without cell wall. Exposure of the naked protoplast membrane allows us to investigate more easily fundamental aspects of cell physiology and cell surface interaction with toxins and pathogens. Protoplast contains cytoplasm along with cell membrane and nucleus. Protoplasts can be generated by stripping the cell wall from plant, bacterial or fungal cells by mechanical, chemical or enzymatic means.
Uttarakhand PMT-2010
Cell : Structure and Functions
169086
Identify the correct statement about the fluid mosaic model of cell membrane.
1 It was proposed by \(\mathrm{J}\) David Robertson in 1972
2 Model resembles the iceberg (as proteins) floating in the sea (of phospholipids).
3 Hydrophilic phosphate head of phospholipids face inwards.
4 Hydrocarbon tails face out ward.
Explanation:
B Fluid model proposed by - singer and Nicolson (1972) According this model proteins molecules occurs in mosaic pattern i.e. protein Iceberg in the sea of lipid or Gulabjamun in the concentration solution of the sugar. In fluid mosaic model there is a lipid bilayer having proteins embedded in them. The protein molecules moves latterly in the lipid layer not flip-flop motion i.e. not from 1 lipid layer to the other lipid layer but lipid molecules rarely exhibit flip-flop movement.
BCECE-2015
Cell : Structure and Functions
169090
Cystoliths are composed of:
1 glucosides
2 calcium oxalate
3 calcium carbonate
4 magnesium oxalate
Explanation:
C Cystoliths are outgrowth of epidermal cell wall. They are visible as dots or variously shaped marks specially in pressed, dried leaves. They may serve as some kind of protection from leaf eating insects or other animals. Cystoliths is the crystal of calcium carbonate that is formed in special cells called as lithocytes which is present in leaf of plants as ficus elastica. It helps in the regulation of calcium level in the plants.
DUMET-2003
Cell : Structure and Functions
169091
Which of the following statements is INCORRECT regarding biological membrane?
1 It is composed of lipids and proteins
2 Peripheral proteins are loosely associated with the membrane
3 Integral proteins span the lipid bilayer
4 Lipids and membrane proteins do not provide structural and functional asymmetry
Explanation:
D Plasma membrane is asymmetric due to oligosaccharides which forms glycoprotein \& glycolipid along with proteins and the components of biological membranes are asymmetrically distributed between the membrane surface. In biological membrane protein is 2 type - Peripheral proteins, which are loosely associated with membrane, \& integral protein which is span in lipid.
KVPY SB \& SX-2016
Cell : Structure and Functions
169092
The most abundant substance of middle lemella is:
1 Suberin
2 Cutin
3 Lignin
4 Pectin
Explanation:
D Middle lamella is the part of cell wall that is the outermost layer in between cells. It is a layer that cements together the primary cell walls of two adjoining plant cells. Middle lamella is made up of calcium and magnesium pectate. Pectin present in this layer is a heteropolysaccharide which helps to bind the two cells together it also helps in cell growth and cell wall.
