Question

1. why does the variant protein fail to do its job? 5 points

it destroys the muscle cells.
its shape is distorted, so it cannot bind to the receptor to send the \stop\ signal.
it turns into fat instead of muscle.

1. connect it: explain how a tiny change in the proteins shape leads to a dog looking like a bodybuilder. 5 points

your answer

Explanation:

For question 2: Protein function is dependent on its specific 3D shape; when a variant protein's shape is altered, it loses the ability to bind to its target receptor, which is required to carry out its role (like sending a "Stop" signal). The other options do not describe the core reason a variant protein fails its function.
For question 3: The tiny shape change disrupts the protein's ability to send the "Stop" signal for muscle growth. Without this signal, muscle cells continue to divide and grow uncontrollably, resulting in excessive muscle development that makes the dog look like a bodybuilder.

Answer:

1. Its shape is distorted, so it cannot bind to the receptor to send the "Stop" signal.
2. The altered protein shape prevents it from delivering the muscle growth "Stop" signal. This allows unregulated muscle cell growth and division, leading to extreme muscle development that gives the dog a bodybuilder-like appearance.