Answer:
This is an example of directional selection.
Explanation:
Directional selection is a type of positive selection where the evolutionary fitness of one genotype is higher compared to the other ones, thereby favoring the selection of one particular phenotype and shifting allele frequencies towards the selected genotype. In a biological context, the directional selection increases the chances for surviving and for reproducing in those organisms that have the alleles favored by this type of selection. Thus, the directional selection produces the loss of genetic variability and leads to the fixation of the dominant alleles.
The G-protein couples receptors are among the most diverse group of the membrane protein receptors. The GPCRs attaches a wide variety of the signalling molecules. They interact with the G proteins which are present in the membrane. Conformational changes occur in the GPCR, when the external signalling molecules attaches to it. The GPCR is desensitized after it becomes activated.
Hence, the answer is 'Option D - desensitized'.
Answer: Describe the monosaccharides. Monosaccharides are the monomers of carbohydrates and are often referred to as “the simple sugars”.
Explanation: You can often recognize a carbohydrate by its suffix – ose (e.g. glucose, sucrose, cellulose, etc.)
The brain and the spinal cord are the organs of the central nervous system.
C because the heart pumps normally with a constant pressure but when it is lower it needs to push harder to get the blood to where it needs to go causing it to malfunction
