Question

Indicate which of the following statements below is true regarding gene control.
1. Development of multicellular organisms from a fertilized egg only rarely involves DNA rearrangements in specialized cells.
2. A typical human cell expresses less than 1% of its approximately 30,000 genes at any given time.
3. Genes that are expressed in all cell types usually vary in their level of expression in different cell types.
4. Many differentiated plant cells can be fully de-differentiated and give rise to an entire plant.

Answer 1

The true statements are the following:  

3. Genes that are expressed in all cell types usually vary in their level of expression in different cell types.

4. Many differentiated plant cells can be fully de-differentiated and give rise to an entire plant.

Explanation:

Gene expression patterns are cell-specific, it means that in a cell genes are expressed at different levels in order to carry out their functions. In consequence, distinct gene expression patterns can be associated with distinct cellular types.  

Plant cells that are differentiated may be reverted to their original (pluripotent) state and even they can be activated to produce a completely totipotent embryo that is then capable of producing differentiated plant tissues and organs.