the covalent bond between the monomers of an enzyme macromolecules are

peptide
ester or
phosphodiester bond
question2
why urctic forx change coloring from brown in summer and white in winter .
My answeers is = fox change phenotype but genotypes does not chane?
am i right ?

The covalent bond between the monomers of an enzyme macromolecule is typically a peptide bond. A peptide bond forms between the carboxyl group of one amino acid and the amino group of another amino acid during the process of protein synthesis.

Regarding your question about the change in color of fox fur, you are partially correct. The change in color is observed in the phenotype of the foxes, which refers to the physical characteristics that can be visibly observed. This change in phenotype is due to a process called "seasonal molting" or "seasonal camouflage."

In the summer, the fox's fur appears brown, which helps it blend in with its environment and remain inconspicuous. This helps it hunt and avoid predators. In the winter, when the environment is covered in snow, the fox's fur changes to white or a lighter color, acting as camouflage to help it remain hidden from prey and predators.

However, it is important to note that while the phenotype changes, the genotype of the fox does not. The fox carries the genes responsible for producing both brown and white fur throughout the year, but the expression of these genes is regulated by various factors, such as photoperiod (day length) and hormone levels.

So, to summarize, the change in color of the fox's fur is a result of seasonal molting and serves as a means of camouflage. While the phenotype changes, the underlying genotypes do not.