The population of beetle will increasingly become green, with subsequent generations, until it becomes the dominant phenotype. This is because the green beetles will be able to camouflage with their environment and avoid being preyed on by the birds as compared to the black beetles. Therefore, the green beetle will have a high chance of reaching the reproductive stage and passing its genes to the next generation as compared to the black beetle.
1,111,1V the human population has increased tremendously, and it's still growing today. That means very much vehicles around, the cost of living well also increase, where will everyone live. It's a little scary.
Answer:
Relative velocity simply means velocity relative to a certain observe point, in this case, the river shore.
This is a type of complex movement; a boat is moving with a certain velocity, let's say 8 m/s. However, the river this boat moves on also has its velocity, let's say 2 m/s. Since the shore isn't moving, the velocity of the boat relative to the shore will be simple resultant velocity of the boat's and the river's velocities.
Let's illustrate this with two examples:
1) if the boat is moving downstream both are moving in the same direction, so the resultant will be 8 m/s + 2 m/s = 10 m/s.
So, any spectator looking at the boat from the shore will think its velocity is 10 m/s, when in reality it's 8 m/s.
2) if the boat is moving upstream, these two velocities have opposite directions, so the resultant will be 8 - 2 = 6 m/s
So, as a short summary, relative speed is an object's speed in regard to another chosen referent point.
Not all substances are soluble an example would be sand
Answer:
In prokaryotes like E.coli, the structural proteins with related function are located in a single transcriptional unit called operon.
Explanation:
All the genes within a promoter are under the control of single promoter i.e they are controlled simultaneously. Usually the product of all the structural genes within a operon are needed at the same time.
There is a regulatory region in the operon which include promoter region and the regions where transcription factors binds. RNA polymerase binds to the promoter region for transcribing the structural genes.
In lac operon, there are three structural genes : lacZ - encodes for beta galactosidase, lacY - encodes for permease and lacA - encodes for trans-acetylase.
Repressor is a transcription factor which binds to the regulatory region called operator. Operator lies between the promoter and the transcription start site. Binding of repressor to the operator site blocks the RNA polymerase from transcribing the structural genes.
Inducer is also a regulatory molecule which can activate or repress the transcription. It does so by binding to activator and repressor. In lac operon allolactose serves as inducer. When allolactose binds to repressor, it prevents its binding to the operator site and thus RNA polymerase successfully transcribes the structural genes.