A science test for me each day is water and alcohol can
a) when lactose is absent, the repressor is active, RNA Polymerase cannot bind to the promoter and the structural gene are not formed.
b) when lactose is present, the lac repressor is inactive, RNA Polymerase can bind to the promotor and the structural genes are formed.
Explanation:
The lac operon in E.coli has genes required for lactose metabolism.
It is expressed only when lactose is present in the medium and glucose is absent.
According to the glucose and lactose level the operon is switched on or off.
The lac repressor or allolactose and catabolite activator protein is present in lac operon.
Glucose is the primary source of energy but bacteria loves to fuel down lactose. To use lactose as an energy source lac operon works.
a) when lactose is absent, the repressor is active, RNA Polymerase cannot bind to the promoter and the structural gene are not formed.
b) when lactose is present, the lac repressor is inactive, RNA Polymerase can bind to the promotor and the structural genes are formed.
The lac repressor is a protein that inhibits transcription of lac operon in the absence of lactose.
Hello,
The answer should be "sound waves".
Reason:
If a gun go off the sound waves can go through anything to allow the person to hear for example: the sound wave can go through walls, water, and hard surface. It can also allow you to hear something but not see it therefore the answer is sound wave!
If you need anymore help feel free to ask me!
Hope this helps!
~Nonportrit
The difference in wavelength of light causes a light wave to produce blue color and another light wave to produce red color.
Explanation:
Light is considered to be a part of electromagnetic spectrum. Light experiences variation in wavelength which causes it to have different colors.
A light with blue color has the shortest wavelength while a light with red color has longest wavelength.
Human eyes can not see all wavelengths of light. Visible light wavelength is the only kind which we can detect.
Changing a wavelength will result in change in color of that light ray.
Color of an object depends on the the light that it reflects.
