Question

1. which of the following hormones requires the help of a membrane receptor to enter a cell?

thyroxine (t4)
androgens
progestogens
insulin

Explanation:

Hormones can be classified into two main types based on their mechanism of action: lipid - soluble (steroid and thyroid hormones) and water - soluble (peptide hormones). Lipid - soluble hormones (such as thyroxine (T4), androgens, progestogens) can pass through the cell membrane directly and bind to intracellular receptors. Water - soluble hormones (such as insulin) cannot pass through the lipid - rich cell membrane. Instead, they bind to membrane receptors on the cell surface, which then triggers an intracellular signaling cascade.

Answer:

insulin