The damaging stage of the pulse beetle is: ((MCAER 2014))

✅Explanation: Myosin is the main protein responsible for muscle contraction. It interacts with actin, another muscle protein, to generate force.

📌 Other Options Explanations:
-Option A: Collagen is a structural protein found in connective tissues, such as skin, bones, and cartilage.
-Option C: Actin is also a muscle protein, but it plays a supporting role in the contraction process.
-Option D: Keratin is a protein found in hair, nails, and skin.

🔑Key Points:
-Contractile proteins-
-Contractile proteins are proteins that facilitate the sliding of contractile fibers of a cell’s cytoskeleton as well as of cardiac and skeletal muscle.
-Contraction of the muscles depends on the presence of contractile proteins such as actin and myosin in the myofilaments.
-They help the muscle tissue to contract and relax to cause movement.

🛑Additional Information:
-Hemp proteins-
-Hemp protein is the protein content of hemp seeds.
-The most important benefit of hemp protein is that it can help to lower the risk of cardiovascular disease, cancer, high cholesterol, and high blood pressure.
-Whey proteins-
-Whey protein is derived from milk.
-It is a source of protein and essential amino acids, which are the building blocks of protein and occur naturally within the body. 
-Lipoproteins-
-Lipoproteins are formed from lipid and protein molecule complexes.
-The prime function of lipoproteins is the transportation and delivery of fatty acids, triacylglycerol, and cholesterol from the target cells to different organs in the human body.