The following are true of insulin except:
- a- Glycopeptide***
- b- Secreted by beta cells
- c- Causes lipogenesis
- d- Promotes glycogenesis.
The correct answer is a) Glycopeptide.
b) Secreted by beta cells:
This is true. Insulin is primarily secreted by beta cells of the pancreatic islets.
c) Causes lipogenesis:
This is partially true. While insulin does stimulate some lipogenesis (fat storage) in adipose tissue, its primary effect is inhibiting lipolysis (fat breakdown).
d) Promotes glycogenesis:
This is true. Insulin plays a crucial role in promoting the uptake of glucose by cells and its conversion into glycogen for storage, especially in the liver and skeletal muscles.
Therefore, insulin is not a glycopeptide. It is a peptide hormone, composed only of amino acids, not carbohydrates.
Additional information:
- Some medications used to treat diabetes, such as GLP-1 agonists, are categorized as glycopeptides. However, these are distinct from insulin in structure and function.
- While insulin indirectly influences fat metabolism, its main focus is regulating blood sugar levels through promoting glucose uptake and storage.
