1.If cells of an individual contain the same set of genes, how do these cells be

Question

1.If cells of an individual contain the same set of genes, how do these cells become different from each other during development?

A) Different cell type-specific regulatory elements in DNA are created during development.

B) Different cell type-specific regulatory elements in DNA are selectively lost during development.

C) Differences in extracellular signals received by each cell lead to differences in the types of regulatory proteins present in each cell.

D) Differences develop in promoter sequences that lead to different signals being produced by each type of cell.

2, An example of a basal transcription factor is _____.

A) RNA polymerase

B) the TATA-binding protein

C) an enhancer-binding transcription factor

D) a silencer-binding transcription factor

E) a promoter-proximal-binding transcription factor

3.The protein p53 activates genes that _____.

A) increase mutation rate

B) lead to higher production of growth factors for the cell

C) increase the rate of endocytosis

D) arrest the cell cycle

Explanation / Answer

1. If the cells of an individual contain same set of genes, becomes different from each other during developmetn because differnces in extracellular signals recieved by each cell lead to differences in the types of regulatory proteins present in each cell.

2. An example for a basal transcription factor is a promoter-proximal-binding transcription factor

3. The protein p53 activates genes that arrest the cell cycle

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