Bro im jus gonna be straight up w you i want to help you but i cant becuase i have no idea what that is
Answer:
Please find the detailed explanation of this statement below
Explanation:
Firstly, a repressed gene is a gene whose expression has been inhibited or repressed. The lac operon in E.coli bacteria is a regulatory unit containing structural genes, a single promoter and operator regions. The promoter is the region where the transcription enzyme (RNA polymerase) binds to in order to transcribe the genes in the lac operon. The structural genes in the lac operon can only be expressed in the presence of lactose sugar.
However, in the absence of lactose, LAC REPRESSOR, which is a transcription factor (protein), prevents the binding of RNA polymerase to the PROMOTER region by binding to the OPERATOR region of the lac operon. This inhibits the expression of the lactose genes in the operon.
Note that, the structural genes in the lac operon (lacZ, lacY, lacA) code for proteins that help break down lactose sugar for energy in the E.coli bacteria. Therefore, a bacteria cell with a repressed lac operon will be unable to degrade lactose sugar.
It is possible to disrupt the plasma membrane by using enzymes and/or detergent agents.
<h3>What is the plasma membrane?</h3>
The plasma membrane is a lipid bilayer that is mainly composed of phospholipids and cholesterol.
In laboratory conditions, it is possible to disrupt this lipid bilayer by using detergent and proteins (enzymes) that break the bonds binding phospholipids.
For example, enzymes can break down the double bonds that bind fatty acids in the lipid bilayer.
In conclusion, the plasma membrane can be break down by applying enzymes and detergents.
Learn more about the cell membrane here:
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Answer:
D: A density-independent factor.
Explanation:
An earthquake is a density-independent limiting factor
