Imagine that you are studying the control of β-globin gene expression in immature red blood cells. (mature red blood cells contain β-globin protein but lack a nucleus and, therefore, the β-globin gene.) if you deleted a sequence of dna outside the protein-coding region of the β-globin gene and found that this increased the rate of transcription, the deleted sequence likely functions as

Silencer

Explanation:

Gene expression is regulated by many upstream and downstream regulatory sequences. A regulatory site may serve as a binding site for positive or negative transcription factors to regulate gene expression. A regulatory site that binds negative regulators/ transcription factors to control transcription is called a silencer.

In the given example, the deletion of a DNA sequence outside the protein-coding region of the beta-globin gene resulted in an increased rate of expression. This means that the deleted sequence was a silencer and served to inhibit the expression of the beta-globin gene.

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation: