Southwest Biology DNA and Cell Differentiation - 5C

DNA helps a cell to become differentiated by -

• directing the cell to create certain proteins.

• allowing water to permeate the cell.

• preventing the nucleus from engaging in any functions.

• deleting potentially harmful genes.

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What controls cell differentiation within organisms?

• The portions of DNA that are read and the proteins that are produced from these portions.

• The shape of chromosomes in the body cells of an organism.

• The length of time it takes a cell to replicate its DNA.

• The size of the nucleus within different cells and the types of nitrogenous bases present.

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Environmental factors can cause DNA within a cell to suffer damage. Environmental factors that are harmful cause cell differentiation primarily by preventing DNA within cell from -

• dissolving into the cell's cytoplasm.

• migrating to the cell's membrane.

• expressing certain genes.

• transforming into RNA.

The role of environmental factors in cellular differentiation is to -

• prevent a cell from dividing and transmitting its DNA to new cells.

• destroy genes so they are repressed.

• induce or repress gene expression.

• assist a cell in dividing and transmitting its DNA to new cells.

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