Question

question 5 of 10
how does a cells history affect the genes that are expressed?
a. all of the genes are turned on during development, and the cells environment determines which proteins are used.
b. the cell receives genes at each stage of development, as it needs new proteins.
c. genes that code for unnecessary proteins are destroyed as a cell develops.
d. as the cell develops, genes are turned on to produce proteins needed at those times.

Explanation:

During cell development, gene expression is regulated. Not all genes are active simultaneously. Instead, genes are activated in a temporal - specific manner to produce the proteins required for the cell's function at different developmental stages.

• Option A is incorrect because not all genes are turned on during development. Gene expression is a regulated process.
• Option B is wrong as a cell does not receive new genes during development. It has a fixed genome (except in some rare cases like mutations in somatic cells).
• Option C is incorrect because genes that code for unnecessary proteins at a particular stage are not destroyed. They are just silenced or not expressed.

Answer:

D. As the cell develops, genes are turned on to produce proteins needed at those times.