Question

which statement correctly shows how bees produce different responses to different pheromones?
a the large and irregular binding site allows a variety of different pheromones with different shapes to bind with a specific protein.
b the unique shape and size of the binding site allows only one pheromone with a specific shape to bind with a specific protein.
c a protein changes the shape of a pheromone by forming covalent bonds at the binding site.
d a pheromone changes the shape of the binding site of a protein by forming covalent bonds.

Explanation:

Proteins have specific binding sites with unique shapes and sizes. Only pheromones with a complementary shape can bind to these sites. This specificity allows bees to produce different responses to different pheromones. Option A is incorrect because a large and irregular binding site would not provide the specificity needed for different responses. Option C is incorrect because it is the pheromone that binds to the protein, not the protein changing the pheromone's shape. Option D is incorrect because it is the pheromone binding to the pre - existing shape of the protein's binding site, not changing the binding site's shape by forming covalent bonds.

Answer:

B. The unique shape and size of the binding site allows only one pheromone with a specific shape to bind with a specific protein.