Transport mechanisms — practice question

Describe the structure of a cellulose molecule and explain why cellulose is a suitable substance for plant cell walls.

With reference to Fig. 5.1, describe the findings of this study.

Explain, in terms of energy flow in ecosystems, the importance of the results in Fig. 5.1.

Digested material in animals is taken up by both facilitated diffusion and active transport. State two similarities and two differences between facilitated diffusion and active transport.