Dr. Lopez studies the cells of oak trees that grow on steep hills. He is learning how the trees can support themselves and get enough food. The trees have very different needs than animals. Describe two structures found in plant cells but not in animal cells. How do these structures help plant cells to meet a plant’s needs?

An atom of nitrogen had seven protons in its nucleus. how many electrons does it have

After reading the paragraph below, answer the questions that follow. researchers have created a robot that has a very thin leg that is moved by cardiac (heart) cells contracting in unison. the robot, made of a polymer similar to that used in making contact lenses, is bathed in heart cells with supporting cells, which then attach to the robot and provide movement as they contract. all of the cardiac cells working together can cause the robot leg to move in a way that individual cells could not. this is an example of a. emergent properties of cells. b. energy flow through an ecosystem. c. adaptation. d. internal environment regulation.

Works together in the synthesis, modification, packaging, and transport of lipids and proteins