The directional selection is the type of natural selection, in which an extreme phenotype is promoted due to the changes in the environment. This causes the changes in the allele frequency and the shifting of the phenotype in a particular direction. In this condition, one of the extreme phenotypes are promoted, which result in the shifting of genotypic frequency either of the homozygous characteristics.
The cAMP receptor protein (CRP) is said to be responsible for positive regulation of the lac operon because (D) CRP bound to the CRP-binding site stimulates the transcription of the lac operon.
CRP is a regulatory protein. It binds to the cAMP and causes a conformational change. This allows the CRP to bind to a specific site at the promoter region of the DNA. This then activates the transcription process.
Lac operon is a group of genes that allow the uptake of glucose in bacteria. There are four components of lac operon: regulator gene, promoter gene, operator gene and structural genes. The machinery of operon is turned on the lactose itself.
To know more about CRP, here
brainly.com/question/25387504
#SPJ4
Answer:
the answer is D. The amount of space something takes up
Explanation:
volume has no set mass, shape, or density. volume can be just plain air, water, gas ext...
PLZ thank and five star
and a brainliest would be nice:-)
Answer:
They hide in cool, shady, moist places under rocks and logs and in damp cellars.
Tiger salamanders can be difficult to spot because of their secretive nature and ability to spend long periods of time burrowed underground
They do not drink, but absorb water through the skin while sitting in puddles, in wet mud or sand, or by flattening their bodies on dew-covered rocks.
Tiger salamanders are wide spread but rarely seen because adults spend most of their lives underground.
They often occupy rodent, tortoise or crayfish holes, or burrow into soft dirt.
Explanation:
I hope these were enough :)
