Answer:
melanocytes, Merkel's cells, langerhans
Ketones are products of fat metabolism. Usually they are not present in urine. However, they may appear in the urine if the diet fails to provide adequate amount of insulin, as in the case of prolonged fasting or starvation or as a result of insulin deficiency (diabetes mellitus). Further, insulin helps the body to use sugar for energy, but without it, fats are break down as energy source.
It occurs within the mitochondria.
Answer:
Viruses are exceptions to the cell theory.
Outside a living medium, virus is considered non living or a crystalline substance.
It is just a strand of DNA in a coat. It is unable to undergo metabolism
Purines; like adenine and guanine.
