Question

which of these does not contain a structural protein?
ovalbumin
tendons
spider silk
ligaments
muscles
part d
defensive proteins are manufactured by the ______ system.
cardiovascular
nervous
digestive
integumentary
immune

Explanation:

1. First question: Ovalbumin is a storage - protein in egg white, not a structural protein. Tendons contain collagen (a structural protein), spider silk is made of silk fibroin (a structural protein), ligaments contain collagen, and muscles have structural proteins like actin and myosin.
2. Second question: Defensive proteins such as antibodies are manufactured by the immune system to fight off pathogens. The cardiovascular system is for circulation, the nervous system for communication and control, the digestive system for breaking down food, and the integumentary system for protection and temperature regulation.

Answer:

1. Ovalbumin
2. Immune