SCIENCE
CELL BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What causes cells to differentiate?
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Sufficient nutrition
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Full expression of all genes
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Specialized functions at different stages of embryo development
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Expression of some genes with suppression of other genes
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Explanation:
Detailed explanation-1: -Differential gene expression is often associated with methylation of DNA, and until recently the prevailing idea was that increased cytosine methylation nearby and within genes correlated with reduced gene expression.
Detailed explanation-2: -Mechanisms responsible for repression of genes involve changes in levels of DNA methylation and alterations in covalent modifications of histone proteins, which lead to chromatin compaction, making genes inaccessible to the transcription machinery.
Detailed explanation-3: -Ribozymes are catalytic RNA molecules used to inhibit gene expression. These molecules work by cleaving mRNA molecules, essentially silencing the genes that produced them.
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