Is an elastic protein that connects tubulin doublets in cilia and flagellae. the resultant bridges play an important role in ciliary and flagellar movement by limiting the extent that adjacent doublets can slide over one another. the resistance to sliding provided by these bridges causes the axoneme to bend.

Legumes, a type of plant, require rhizobia, a type of soil bacteria, to survive since these organisms fix nitrogen during photosynthesis. rhizobia use the legumes for food. what would most likely happen to the legume population if rhizobia suddenly became extinct?

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism