BIOLOGICAL CLASSIFICATION
VIRUSES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Cell division (mitosis & cytokinesis)
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Meiosis (gametes are produced)
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Cellular differentiation (cells become specialized types with specific functions)
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The single-celled zygote continuously increases in size
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New cells are obtained by the zygote from its local environment
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Detailed explanation-1: -A multicellular organism develops from a single cell (the zygote) into a collection of many different cell types, organized into tissues and organs. Development involves cell division, body axis formation, tissue and organ development, and cell differentiation (gaining a final cell type identity).
Detailed explanation-2: -Cell differentiation is how generic embryonic cells become specialized cells. This occurs through a process called gene expression. Gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a cell functions.
Detailed explanation-3: -In multicellular organisms cells differentiate and specialize to form tissues which cooperate to form organs such as brains, kidneys, hearts, stomachs, and lungs. Without specialized cells multicellular organisms would be nothing more than a homogeneous lump of cells.
Detailed explanation-4: -Cells undergo a process called differential gene expression. This process allows cells to become specialized, as their structure determines their function. The process begins when a stimulus acts on an unspecialized cell (a cell that has the potential to become any cell in the body-multipotent stem cells).
Detailed explanation-5: -Cell specializations make it possible to express fewer genes in individual cells of multicellular organisms, thus protecting genes from the damage of mutagens.