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Which one of the following pairs of chemical substances is correctly categorised?

  1. A
    Secretin and rhodopsin - Polypeptide hormones
  2. B
    Calcitonin and thymosin - Thyroid hormones
  3. C
    Pepsin and prolactin - Two digestive enzymes secreted in stomach
  4. D
    Troponin and myosin - Complex proteins in striated muscles

Solution & Step-by-step Explanation

* Troponin and Myosin are both proteins involved in muscle contraction in striated muscles.Secretin is a hormone; Rhodopsin is a pigment.Calcitonin is from thyroid; Thymosin is from thymus.Pepsin is an enzyme; Prolactin is a hormone.

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Which one of the following pairs of chemical substances is correctly categorised?
A
Secretin and rhodopsin - Polypeptide hormones
B
Calcitonin and thymosin - Thyroid hormones
C
Pepsin and prolactin - Two digestive enzymes secreted in stomach
D
Troponin and myosin - Complex proteins in striated muscles

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