Question

multiple choice question due to their chemistries, ____ are hormone whose receptor will be inside the cell, while ____ hormones will have their receptor on the cell membrane. protein; steroid protein; biogenic amine steroid; protein biogenic amine; steroid

Explanation:

Steroid hormones are lipid - soluble, so they can pass through the cell membrane and their receptors are inside the cell. Protein (and also biogenic amine) hormones are water - soluble and cannot pass through the cell membrane, so their receptors are on the cell membrane. So the correct pairing is steroid (receptor inside the cell) and protein (receptor on the cell membrane)? Wait, no, let's re - examine. Wait, the first blank is for hormones with receptor inside the cell, the second for receptor on the membrane. Steroid hormones are lipid - soluble, enter the cell, receptor inside. Protein hormones (and biogenic amines like epinephrine) are water - soluble, can't enter, so receptor on membrane. Wait, the options: Let's analyze each option.

Option 1: protein; steroid → Protein hormones have receptors on membrane, steroid on inside. So this would be reversed. So wrong.

Option 2: protein; biogenic amine → Both protein and biogenic amine hormones have receptors on membrane. So wrong.

Option 3: steroid; protein → Steroid hormones (lipid - soluble) have receptors inside the cell. Protein hormones (water - soluble) have receptors on the cell membrane. This matches.

Option 4: biogenic amine; steroid → Biogenic amine hormones have receptors on membrane, steroid on inside. Reversed. So wrong.

So the correct option is the one with steroid (first) and protein (second), which is the third option? Wait, wait the options are:

1. protein; steroid

1. protein; biogenic amine

1. steroid; protein

1. biogenic amine; steroid

So the correct answer is the option where the first is steroid (receptor inside) and the second is protein (receptor on membrane), so option "steroid; protein" (the third option? Wait the original options: looking at the image, the options are:

• protein; steroid

• protein; biogenic amine

• steroid; protein

• biogenic amine; steroid

So the correct one is "steroid; protein" because steroid hormones (lipid - soluble) can cross the cell membrane, so their receptors are inside the cell. Protein hormones (and peptide hormones, etc.) are water - soluble, can't cross the membrane, so their receptors are on the cell membrane. Biogenic amines like epinephrine also have receptors on the membrane. So the correct pairing is steroid (receptor inside) and protein (receptor on membrane).

Answer:

C. steroid; protein (assuming the third option is labeled C, but based on the options given in the image, the option with "steroid; protein" is the correct one)