169070
Which one of the following is wrongly matched?
1 Fungi - Chitin
2 Phospholipid - Plasma membrane
3 Enzyme - Lipopolysaccharide
4 ATP - Nucleotide derivative
5 Antibody - Glycoprotein
Explanation:
C Fungal cell wall is mainly composed of glucans, chitin and glycoproteins. Plasma membrane is composed mainly of phospholipids. They are arranged in two layers, called the phospholipid bilayer. Enzymes are proteins that act as biological catalyst by accelerating chemical reactions. A single molecule of Adenosine triphosphate (ATP) is a nucleotide derivatives. Immunoglobulins (Ig) or antibodies are glycoproteins produced by plasma cells
Kerala PMT-2009
Cell : Structure and Functions
169071
Consider the following statements with reference to facilitated transport. 1.Requires ATP energy 2.Transport saturates 3.Highly selective 4.Requires special membrane properties 5.Uphill transport Of the above statements
1 1,2 and 3 are relevant but 4 and 5 are irrelevant
2 2, 3 and 5 are relevant but 1 and 4 are irrelevant
3 3, 4 and 5 are relevant but 1 and 2 are irrelevant
4 1, 4 and 5 are relevant but 2 and 3 are irrelevant
5 2, 3 and 4 are relevant but 1 and 5 are irrelevant
Explanation:
E Facilitated diffusion is a type of passive transport, no require of ATP energy which requires special type of membrane proteins to carry different molecules or ions across the membrane along from high concentration to low concentration. These proteins tend to be selective and associated with a few select molecules or ions. Since there is a limited quantity of such transport proteins, the degree to which this can lead to saturation if the concentration of the molecules, or ions. to be transported is extremely high. Thus facilitated diffusion is highly selective. Active transport is called an uphill transport because it occurs against the concentration gradient. So the facilitated diffusion involves downhill (higher to lower concentration) movement of molecules with the help of special membrane proteins.
Kerala PMT-2012
Cell : Structure and Functions
169074
Cell membrane in animals is composed mainly of the molecule of :
1 lipids
2 proteins
3 lipids and proteins
4 carbohydrates
Explanation:
C Cell membrane consists of lipids, proteins and a small amount of carbohydrate. The ratio of protein and lipid varies considerably in different cell type. Usually the ratio is \(60 \%\) protein and \(40 \%\) lipid.
JIPMER-2006
Cell : Structure and Functions
169075
Which one of the following is correct for the transmembrane proteins in lipid bilayer of plasma membrane?
1 They are absent in animal cells.
2 They act as channel proteins
3 They are absent in plant cells.
4 They are only externally located.
Explanation:
B In the fluid mosaic model of plasma membrane, membrane protein can be classified as integral or peripheral. - Integral membrane proteins are permanently embedded within the phospholipid bilayer of plasma membrane. They have a range of functions. Such functions include transporting molecules across the membrane.
169070
Which one of the following is wrongly matched?
1 Fungi - Chitin
2 Phospholipid - Plasma membrane
3 Enzyme - Lipopolysaccharide
4 ATP - Nucleotide derivative
5 Antibody - Glycoprotein
Explanation:
C Fungal cell wall is mainly composed of glucans, chitin and glycoproteins. Plasma membrane is composed mainly of phospholipids. They are arranged in two layers, called the phospholipid bilayer. Enzymes are proteins that act as biological catalyst by accelerating chemical reactions. A single molecule of Adenosine triphosphate (ATP) is a nucleotide derivatives. Immunoglobulins (Ig) or antibodies are glycoproteins produced by plasma cells
Kerala PMT-2009
Cell : Structure and Functions
169071
Consider the following statements with reference to facilitated transport. 1.Requires ATP energy 2.Transport saturates 3.Highly selective 4.Requires special membrane properties 5.Uphill transport Of the above statements
1 1,2 and 3 are relevant but 4 and 5 are irrelevant
2 2, 3 and 5 are relevant but 1 and 4 are irrelevant
3 3, 4 and 5 are relevant but 1 and 2 are irrelevant
4 1, 4 and 5 are relevant but 2 and 3 are irrelevant
5 2, 3 and 4 are relevant but 1 and 5 are irrelevant
Explanation:
E Facilitated diffusion is a type of passive transport, no require of ATP energy which requires special type of membrane proteins to carry different molecules or ions across the membrane along from high concentration to low concentration. These proteins tend to be selective and associated with a few select molecules or ions. Since there is a limited quantity of such transport proteins, the degree to which this can lead to saturation if the concentration of the molecules, or ions. to be transported is extremely high. Thus facilitated diffusion is highly selective. Active transport is called an uphill transport because it occurs against the concentration gradient. So the facilitated diffusion involves downhill (higher to lower concentration) movement of molecules with the help of special membrane proteins.
Kerala PMT-2012
Cell : Structure and Functions
169074
Cell membrane in animals is composed mainly of the molecule of :
1 lipids
2 proteins
3 lipids and proteins
4 carbohydrates
Explanation:
C Cell membrane consists of lipids, proteins and a small amount of carbohydrate. The ratio of protein and lipid varies considerably in different cell type. Usually the ratio is \(60 \%\) protein and \(40 \%\) lipid.
JIPMER-2006
Cell : Structure and Functions
169075
Which one of the following is correct for the transmembrane proteins in lipid bilayer of plasma membrane?
1 They are absent in animal cells.
2 They act as channel proteins
3 They are absent in plant cells.
4 They are only externally located.
Explanation:
B In the fluid mosaic model of plasma membrane, membrane protein can be classified as integral or peripheral. - Integral membrane proteins are permanently embedded within the phospholipid bilayer of plasma membrane. They have a range of functions. Such functions include transporting molecules across the membrane.
169070
Which one of the following is wrongly matched?
1 Fungi - Chitin
2 Phospholipid - Plasma membrane
3 Enzyme - Lipopolysaccharide
4 ATP - Nucleotide derivative
5 Antibody - Glycoprotein
Explanation:
C Fungal cell wall is mainly composed of glucans, chitin and glycoproteins. Plasma membrane is composed mainly of phospholipids. They are arranged in two layers, called the phospholipid bilayer. Enzymes are proteins that act as biological catalyst by accelerating chemical reactions. A single molecule of Adenosine triphosphate (ATP) is a nucleotide derivatives. Immunoglobulins (Ig) or antibodies are glycoproteins produced by plasma cells
Kerala PMT-2009
Cell : Structure and Functions
169071
Consider the following statements with reference to facilitated transport. 1.Requires ATP energy 2.Transport saturates 3.Highly selective 4.Requires special membrane properties 5.Uphill transport Of the above statements
1 1,2 and 3 are relevant but 4 and 5 are irrelevant
2 2, 3 and 5 are relevant but 1 and 4 are irrelevant
3 3, 4 and 5 are relevant but 1 and 2 are irrelevant
4 1, 4 and 5 are relevant but 2 and 3 are irrelevant
5 2, 3 and 4 are relevant but 1 and 5 are irrelevant
Explanation:
E Facilitated diffusion is a type of passive transport, no require of ATP energy which requires special type of membrane proteins to carry different molecules or ions across the membrane along from high concentration to low concentration. These proteins tend to be selective and associated with a few select molecules or ions. Since there is a limited quantity of such transport proteins, the degree to which this can lead to saturation if the concentration of the molecules, or ions. to be transported is extremely high. Thus facilitated diffusion is highly selective. Active transport is called an uphill transport because it occurs against the concentration gradient. So the facilitated diffusion involves downhill (higher to lower concentration) movement of molecules with the help of special membrane proteins.
Kerala PMT-2012
Cell : Structure and Functions
169074
Cell membrane in animals is composed mainly of the molecule of :
1 lipids
2 proteins
3 lipids and proteins
4 carbohydrates
Explanation:
C Cell membrane consists of lipids, proteins and a small amount of carbohydrate. The ratio of protein and lipid varies considerably in different cell type. Usually the ratio is \(60 \%\) protein and \(40 \%\) lipid.
JIPMER-2006
Cell : Structure and Functions
169075
Which one of the following is correct for the transmembrane proteins in lipid bilayer of plasma membrane?
1 They are absent in animal cells.
2 They act as channel proteins
3 They are absent in plant cells.
4 They are only externally located.
Explanation:
B In the fluid mosaic model of plasma membrane, membrane protein can be classified as integral or peripheral. - Integral membrane proteins are permanently embedded within the phospholipid bilayer of plasma membrane. They have a range of functions. Such functions include transporting molecules across the membrane.
169070
Which one of the following is wrongly matched?
1 Fungi - Chitin
2 Phospholipid - Plasma membrane
3 Enzyme - Lipopolysaccharide
4 ATP - Nucleotide derivative
5 Antibody - Glycoprotein
Explanation:
C Fungal cell wall is mainly composed of glucans, chitin and glycoproteins. Plasma membrane is composed mainly of phospholipids. They are arranged in two layers, called the phospholipid bilayer. Enzymes are proteins that act as biological catalyst by accelerating chemical reactions. A single molecule of Adenosine triphosphate (ATP) is a nucleotide derivatives. Immunoglobulins (Ig) or antibodies are glycoproteins produced by plasma cells
Kerala PMT-2009
Cell : Structure and Functions
169071
Consider the following statements with reference to facilitated transport. 1.Requires ATP energy 2.Transport saturates 3.Highly selective 4.Requires special membrane properties 5.Uphill transport Of the above statements
1 1,2 and 3 are relevant but 4 and 5 are irrelevant
2 2, 3 and 5 are relevant but 1 and 4 are irrelevant
3 3, 4 and 5 are relevant but 1 and 2 are irrelevant
4 1, 4 and 5 are relevant but 2 and 3 are irrelevant
5 2, 3 and 4 are relevant but 1 and 5 are irrelevant
Explanation:
E Facilitated diffusion is a type of passive transport, no require of ATP energy which requires special type of membrane proteins to carry different molecules or ions across the membrane along from high concentration to low concentration. These proteins tend to be selective and associated with a few select molecules or ions. Since there is a limited quantity of such transport proteins, the degree to which this can lead to saturation if the concentration of the molecules, or ions. to be transported is extremely high. Thus facilitated diffusion is highly selective. Active transport is called an uphill transport because it occurs against the concentration gradient. So the facilitated diffusion involves downhill (higher to lower concentration) movement of molecules with the help of special membrane proteins.
Kerala PMT-2012
Cell : Structure and Functions
169074
Cell membrane in animals is composed mainly of the molecule of :
1 lipids
2 proteins
3 lipids and proteins
4 carbohydrates
Explanation:
C Cell membrane consists of lipids, proteins and a small amount of carbohydrate. The ratio of protein and lipid varies considerably in different cell type. Usually the ratio is \(60 \%\) protein and \(40 \%\) lipid.
JIPMER-2006
Cell : Structure and Functions
169075
Which one of the following is correct for the transmembrane proteins in lipid bilayer of plasma membrane?
1 They are absent in animal cells.
2 They act as channel proteins
3 They are absent in plant cells.
4 They are only externally located.
Explanation:
B In the fluid mosaic model of plasma membrane, membrane protein can be classified as integral or peripheral. - Integral membrane proteins are permanently embedded within the phospholipid bilayer of plasma membrane. They have a range of functions. Such functions include transporting molecules across the membrane.
