Which one of the following pairs of chemical substances, is correctly categorised?
Which one of the following pairs of chemical substances, is correctly categorised?
Calcitonin and thymosin-Thyroid hormones
Pepsin and prolactin-Two digestive enzymes secreted in stomach
Troponin and myosin-Complex proteins in striated muscles
Secretin and rhodopsin-Polypeptide hormones
Solution
Striated muscle consists of large number of muscle fibres called myofibrils. Myofibrils are made up of actin and myosin protein. The actin or secondary myofilaments also possess troponin and tropomyosin protein.
Thymosin hormone is secreted from thymus gland. Prolactin is a hormone secreted from anterior lobe of pituitary
Rhodopsin is a pigment found in rod cells of eye.