In simple terms, Cell Theory can be expressed as living organisms are composed and consists of cells and it arises from the surviving cells (existing cells).
<u>Explanation:</u>
Cell Theory:
- The term "Cell Theory" has created an impact in the biology field and it is now confirmed that cell provides the basic structure to the living organisms and Robert Hooke started doing researching about the cells.
Principles of cell theory:
The three principles to the cell theory are listed here,
- All organisms are made up of one or more cells.
- Cells arise from other cells.
- The Cell is the fundamental unit of structure and organization.
Contribution to Cell Theory:
- Schwann and Schleiden are the two scientists who discovered lots of information about the cells and they have contributed lots to cell theory.
- Schleiden states that every part of plants are consists of cells and he states that cells were done by the crystallization process.
- Schwann states that every part of plants and animals were consists of cells.
- Based on their contribution postulates of cell theory has been proposed.
<u>Types of cells:</u>
The cells are classified as Eukaryotes Cell and Prokaryotes Cell
- Presence of Mitochondria
- Presence of Cytoskeleton
- Presence of Membrane-bound Nucleus
Examples: Animals and plants
- Absence of Mitochondria
- Absence of Cytoskeleton
- Absence of Membrane-bound Nucleus
Examples: Bacteria
Powerful mutagens may result in chromosomal instability,<span> causing chromosomal breakages and rearrangement of the chromosomes such as </span>translocation<span>, </span>deletion<span>, and </span>inversion<span>. Such mutagens are called </span>clastogens<span>. </span>Some mutagens can<span> cause aneuploidy and change the number of </span>chromosomes<span> in the cell. (Hope this helps you.)</span>
The discovery of new elements such as gallium demonstrated the predictivinnes ability of the periodic table proposed by Dimitri Medeleiev.
Mendeleieve observed that, when the elements were organized by ascending atomic mass, a periodic pattern of the properties appeared. The elements arranged in sane columns showed similar properties. So Mendeleiev predicted the existence of elements that had not been discovered but that he affirmed that should have some properties given the position that they would occupy.
Gallium is an example of one of the elements that was discovered and exhibited the properties predicted by the space that it occupies in the periodic table.
Environmental factors typically activate genes in a cell by causing the cell to transcribe specific DNA segments to mRNA for translation.
This interaction is an example of environmental factors affecting <u><em>genetic expression</em></u>. In these situations, the environment causes specific segments of DNA to be expressed, meaning they are transcribed to mRNA and subsequently used to form proteins.
Meanwhile, other parts of the genome remain or are forced to be silent. This can be a result of mutations or simple biochemical reactions between the environment and the genome.
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