analyze the example of gene expression of the bacteria below: A piece of DNA is transcribed into a piece of mRNA. The mRNA is translated in a protein. The protein has a chemical bonded to it that allows the protein to bond to a second piece of DNA. The protein chemical substrate prevents the second piece of DNA from being transcribed into mRNA. Why would the bacteria regulate gene expression in this manner? To express genes during reproduction To ensure gene expression when the initialing chemical is present To prevent gene expression if the initialing chemical is already provided To make sure the genes are constantly being expressed

To make sure the genes are constantly being expressed

Explanation:

To prevent gene expression if the initialing chemical is already provided

the right is separation by density .

take the blood which is a good example of a heterogeneous mixture.

blood is a vital liquid in our body, which transports oxygen from the air to our lungs so we can breathe. it is also used to eject wastes, such as carbon dioxide, to bring cells and molecules of the immune system to the tissues, and to spread hormones throughout the body. it corresponds to plasma, red blood cells, white blood cells, platelets and hemoglobins combined.

in medical tests centrifugal force is used to separate the different components of the blood.

in general, the centrifugation will allow to separate and analyze the different components of the blood, to know if the rate of white blood cells in the blood of a patient, for example, is normal, and therefore to know if his system immune is integrity.

under the action of centrifugal force, the solid components in the blood are drawn to the bottom of the tube in which the blood is contained. the centrifugal force then acts as an accelerated settling. it separates plasma from red blood cells and white blood cells.