Tag: cell biology
Questions Related to cell biology
The cell wall of certain fungi is made of:
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Lignin
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Suberin
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Chitin
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Pectin
Cell theory states that
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All cells are living.
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All cells have nucleus.
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Cells are fundamental and structural units of living organisms.
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Cells reproduce by mitosis and meiosis.
Cell theory was propounded by
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Schleiden and Schwann
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Watson and Crick
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Mendel and Morgan
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Wallace and Darwin
The cell theory was jointly put forward by Schleiden and Schwann in their paper, "Microscope investigations on the similarity of structure and growth of animals and plants''. The theory stated that 'the cell are the units of both structure and function of the organisms'.
The cell theory is not applicable to____________
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Bacteria
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Algae
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Virus
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Fungi
The bottom line is that viruses are not alive and not related to cells in any way. The cell theory states that all living things are made of cells, cells are the basic units of structure and function of living things and that all cells come from other cells. Since, viruses are not made of cells and do not use cells in any of their processes, they are not related to the cell theory.
A virus is nothing more than a protein coat surrounding a piece of DNA or RNA. Sure, they can adapt to the environment and respond to stimuli, but they do not use energy, nor do they grow. These are all characteristics of cells.
Which of the following scientists discovered cell theory?
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Rudolf Virchow
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Mattias Scheiden
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Theodor Schwann
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All of the above
Cell theory is a scientific theory, which describes the properties of cells. These cells are the basic unit of structure in all organisms and also the basic unit of reproduction. Cell theory was eventually formulated in 1838. This is usually credited to Mattias Schleiden and Theodor Schwann. The cell theory, was further expanded by Virchow. Cell theory, has become the foundation of biology and is the most widely accepted explanation of the function of cells.
So, the correct answer is option D.
Which of the following statement is not a statement from the cell theory?
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All living organisms are composed of one or more cells.
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Cells are the smallest unit of life that can replicate independently.
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The cell is the basic unit of structure and organisation in organisms.
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All cells come from preexisting living cells.
The cell theory is one of the basic principles of biology. The credit
for the formulation of this theory is given to German scientists,
Theodor Schwann, Mattias Schleiden. Cell theory, stated that cells arise from pre-existing cells. They donot have the potential to replicate independently. They depend upon the parent cell, for the enzymes which are used for replication.
So, the correct answer is option B.
Who proposed the cell theory?
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Schleiden and Schwann
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Watson and Crick
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Mendel and Morgan
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Robert Hooke
Cell theory was proposed by a German botanist, Matthias Schleiden and English zoologist, Theodor Schwann in the year 1839. The cell theory states
1) Cells are the building blocks of living organisms.
2) All living organisms are composed of cells and a cell is the basic structural and functional unit
3) All cells arise from pre-existing cells.
The smallest structural and functional unit of life is
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Organ
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Cell
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Tissue
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Organ system
- The cell is the smallest structural and functional unit of living organisms, which can exist on its own. Therefore, it is sometimes called the building block of life. Cell theory has 3 basic points.
- All living things are made of cells.
- The cell is the smallest living thing that can perform all the functions of life.
- All cells must come from pre-existing cells. Hence option B is correct.
T. Schwann and M. Schleiden were
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Dutch biologists
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English biologists
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Austrian biologists
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German biologists
Cell theory was proposed by a German botanist, Matthias Schleiden and
English zoologist, Theodor Schwann in the year 1839. Cell theory was considered as most acceptable theory which, elucidated the functioning of cell. The cell theory includes the following points -
1) All living things are made up of cells.
2) The cell is the smallest living thing that can perform all the functions of life.
3) All cells must come from pre-existing cells.
So, the correct answer is option D.
Which of the following forms the highest level of organisation?
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Organ
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Cell
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Tissue
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Organ system
- The cell is the smallest structural and functional unit of life.