PATHOLOGY MCQ
CELL DAMAGE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Each cell type contains only the active parts of the DNA needed for that cell type
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Each cell type has only one chromosome containing the DNA neede for that cell type.
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Each cell has an identical copy of DNA with enzymes controlling the expression of specific genes, leading to a variety of cells
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Each cell has multiple copies of DNA that are affected in different ways by the environment to change the function of the cell at regular intervals.
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Detailed explanation-1: -The embryonic cells become specialized for a variety of functions. Which of these statements best describe how different cell types develop? each cell has an identical copy of DNA with enzymes controlling the expression of specific genes, leading to a variety of cells.
Detailed explanation-2: -From a single fertilized ovum undergoing a series of rapid cell divisions, a human infant develops. The embryonic cells become specialized for a variety of functions.
Detailed explanation-3: -Differentiation is the process by which an unspecialized cell, such as a fertilized egg cell, divides many times to produce specialized cells. During differentiation, certain genes are turned on, or become activated, while other genes are switched off, becoming inactivated. This process is regulated by the cell.
Detailed explanation-4: -The differentiation of cells during embryogenesis is the key to cell, tissue, organ, and organism identity. Once an egg is fertilized by a sperm, a zygote is formed. The zygote divides into multiple cells in a process known as cleavage, triggering the beginning of embryonic differentiation.
Detailed explanation-5: -Two cells in the embryo are able to become different types of cells due to a process called cell differentiation. Cell differentiation is a gene expression mechanism which will determine what type of cell a cell will become. All cells have the same DNA and genes, however not all of the same genes and DNA are activated.