Which of the following hormones have antagonistic (opposing) effects?

Glucagon hormone is secreted by

$A$ sample of urine was diagnosed to contain a high content of glucose and ketone bodies. Based on this observation, answer the following:
$(a)$ Which endocrine gland and hormone is related to this condition?
$(b)$ Name the cells on which this hormone acts.
$(c)$ What is the condition called and how can it be rectified?

Which type of bond is present in the structure of hormones secreted by the pancreas?

Failure of insulin production results in

Which gland is responsible for the process of converting glucose into glycogen in the liver?