270674
A student was given a sample of two tissues. He observes the tissues under the microscope and draws their figures ( 1 and 2 ) as shown below.
Identify the tissues ( 1 and 2).
270675
Which of the following statement(s) regarding cell junctions is/are correct?
1 Tight junctions help to stop substances from leaking across a tissue.
2 Adhering junctions perform cementing to keep neighbouring cells together.
3 Gap junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small molecules and sometimes big molecules.
4 All of the above
Explanation:
(d) A cell junction (or intercellular bridge) is a type of structure that exists within the tissue of some multicellular organisms, such as animals. Cell junctions consist of multiprotein complexes that provide contact between neighbouring cells or between a cell and the extracellular matrix. There are three major types of cell junctions: adherens junctions, desmosomes and hemidesmosomes (anchoring junctions); gap junctions (communicating junction); tight junctions (occluding junctions).
NCERT Page-102
Structural Organization in Animals
270676
Choose the correctly matched pair.
1 Inner lining of salivary ducts - Ciliated epithelium
2 Moist surface of buccal cavity - Glandular epithelium
3 Tubular parts of nephrons - Cuboidal epithelium
4 Inner surface of bronchioles - Squamous epithelium
Explanation:
(c)
(i) Inner lining of salivary ducts - Compound epithelium
(ii) Moist surface of buccal cavity - Compound epithelium
(iii) Tubular parts of nephorns - Cuboidal epithelium
(iv) Inner surface of bronchioles - Ciliated epithelium
NCERT Page-101
Structural Organization in Animals
270677
The function of the gap junction is to:
1 separate two cells from each other.
2 stop substance from leaking across a tissue.
3 performing cementing to keep neighbouring cells together.
4 facilitate communication between adjoining cells by connecting the cytoplasm for rapid transfer of ions, small molecules and some large molecules.
Explanation:
(d) Most cells in animal tissues (except for a few terminally differentiated cells such as skeletal muscle cells and blood cells) are in communication with their adjoining cells via gap junctions. At the place where gap junction is present, membranes of two adjacent cells are separated by a uniform narrow gap of about 2-4 nm. The gap is spanned by channel forming proteins called connexins, which allowing organic ions, and other small water-soluble molecules to pass directly from cytoplasm of one cell to cytoplasm of another cell.
270674
A student was given a sample of two tissues. He observes the tissues under the microscope and draws their figures ( 1 and 2 ) as shown below.
Identify the tissues ( 1 and 2).
270675
Which of the following statement(s) regarding cell junctions is/are correct?
1 Tight junctions help to stop substances from leaking across a tissue.
2 Adhering junctions perform cementing to keep neighbouring cells together.
3 Gap junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small molecules and sometimes big molecules.
4 All of the above
Explanation:
(d) A cell junction (or intercellular bridge) is a type of structure that exists within the tissue of some multicellular organisms, such as animals. Cell junctions consist of multiprotein complexes that provide contact between neighbouring cells or between a cell and the extracellular matrix. There are three major types of cell junctions: adherens junctions, desmosomes and hemidesmosomes (anchoring junctions); gap junctions (communicating junction); tight junctions (occluding junctions).
NCERT Page-102
Structural Organization in Animals
270676
Choose the correctly matched pair.
1 Inner lining of salivary ducts - Ciliated epithelium
2 Moist surface of buccal cavity - Glandular epithelium
3 Tubular parts of nephrons - Cuboidal epithelium
4 Inner surface of bronchioles - Squamous epithelium
Explanation:
(c)
(i) Inner lining of salivary ducts - Compound epithelium
(ii) Moist surface of buccal cavity - Compound epithelium
(iii) Tubular parts of nephorns - Cuboidal epithelium
(iv) Inner surface of bronchioles - Ciliated epithelium
NCERT Page-101
Structural Organization in Animals
270677
The function of the gap junction is to:
1 separate two cells from each other.
2 stop substance from leaking across a tissue.
3 performing cementing to keep neighbouring cells together.
4 facilitate communication between adjoining cells by connecting the cytoplasm for rapid transfer of ions, small molecules and some large molecules.
Explanation:
(d) Most cells in animal tissues (except for a few terminally differentiated cells such as skeletal muscle cells and blood cells) are in communication with their adjoining cells via gap junctions. At the place where gap junction is present, membranes of two adjacent cells are separated by a uniform narrow gap of about 2-4 nm. The gap is spanned by channel forming proteins called connexins, which allowing organic ions, and other small water-soluble molecules to pass directly from cytoplasm of one cell to cytoplasm of another cell.
270674
A student was given a sample of two tissues. He observes the tissues under the microscope and draws their figures ( 1 and 2 ) as shown below.
Identify the tissues ( 1 and 2).
270675
Which of the following statement(s) regarding cell junctions is/are correct?
1 Tight junctions help to stop substances from leaking across a tissue.
2 Adhering junctions perform cementing to keep neighbouring cells together.
3 Gap junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small molecules and sometimes big molecules.
4 All of the above
Explanation:
(d) A cell junction (or intercellular bridge) is a type of structure that exists within the tissue of some multicellular organisms, such as animals. Cell junctions consist of multiprotein complexes that provide contact between neighbouring cells or between a cell and the extracellular matrix. There are three major types of cell junctions: adherens junctions, desmosomes and hemidesmosomes (anchoring junctions); gap junctions (communicating junction); tight junctions (occluding junctions).
NCERT Page-102
Structural Organization in Animals
270676
Choose the correctly matched pair.
1 Inner lining of salivary ducts - Ciliated epithelium
2 Moist surface of buccal cavity - Glandular epithelium
3 Tubular parts of nephrons - Cuboidal epithelium
4 Inner surface of bronchioles - Squamous epithelium
Explanation:
(c)
(i) Inner lining of salivary ducts - Compound epithelium
(ii) Moist surface of buccal cavity - Compound epithelium
(iii) Tubular parts of nephorns - Cuboidal epithelium
(iv) Inner surface of bronchioles - Ciliated epithelium
NCERT Page-101
Structural Organization in Animals
270677
The function of the gap junction is to:
1 separate two cells from each other.
2 stop substance from leaking across a tissue.
3 performing cementing to keep neighbouring cells together.
4 facilitate communication between adjoining cells by connecting the cytoplasm for rapid transfer of ions, small molecules and some large molecules.
Explanation:
(d) Most cells in animal tissues (except for a few terminally differentiated cells such as skeletal muscle cells and blood cells) are in communication with their adjoining cells via gap junctions. At the place where gap junction is present, membranes of two adjacent cells are separated by a uniform narrow gap of about 2-4 nm. The gap is spanned by channel forming proteins called connexins, which allowing organic ions, and other small water-soluble molecules to pass directly from cytoplasm of one cell to cytoplasm of another cell.
270674
A student was given a sample of two tissues. He observes the tissues under the microscope and draws their figures ( 1 and 2 ) as shown below.
Identify the tissues ( 1 and 2).
270675
Which of the following statement(s) regarding cell junctions is/are correct?
1 Tight junctions help to stop substances from leaking across a tissue.
2 Adhering junctions perform cementing to keep neighbouring cells together.
3 Gap junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small molecules and sometimes big molecules.
4 All of the above
Explanation:
(d) A cell junction (or intercellular bridge) is a type of structure that exists within the tissue of some multicellular organisms, such as animals. Cell junctions consist of multiprotein complexes that provide contact between neighbouring cells or between a cell and the extracellular matrix. There are three major types of cell junctions: adherens junctions, desmosomes and hemidesmosomes (anchoring junctions); gap junctions (communicating junction); tight junctions (occluding junctions).
NCERT Page-102
Structural Organization in Animals
270676
Choose the correctly matched pair.
1 Inner lining of salivary ducts - Ciliated epithelium
2 Moist surface of buccal cavity - Glandular epithelium
3 Tubular parts of nephrons - Cuboidal epithelium
4 Inner surface of bronchioles - Squamous epithelium
Explanation:
(c)
(i) Inner lining of salivary ducts - Compound epithelium
(ii) Moist surface of buccal cavity - Compound epithelium
(iii) Tubular parts of nephorns - Cuboidal epithelium
(iv) Inner surface of bronchioles - Ciliated epithelium
NCERT Page-101
Structural Organization in Animals
270677
The function of the gap junction is to:
1 separate two cells from each other.
2 stop substance from leaking across a tissue.
3 performing cementing to keep neighbouring cells together.
4 facilitate communication between adjoining cells by connecting the cytoplasm for rapid transfer of ions, small molecules and some large molecules.
Explanation:
(d) Most cells in animal tissues (except for a few terminally differentiated cells such as skeletal muscle cells and blood cells) are in communication with their adjoining cells via gap junctions. At the place where gap junction is present, membranes of two adjacent cells are separated by a uniform narrow gap of about 2-4 nm. The gap is spanned by channel forming proteins called connexins, which allowing organic ions, and other small water-soluble molecules to pass directly from cytoplasm of one cell to cytoplasm of another cell.
