Which of the following is a true statement about diffusion?

a.
diffusion is only important for animal cells.

b.
diffusion requires energy input from the cell.

c.
only water can diffuse across a cell membrane.

d.
molecules move from areas of high concentration to areas of low concentration.

Providing immunity by injecting the body with a weakened form a pathogen is known as

Match each description to the level of organization

How do high-energy electrons from glycolysis and the krebs cycle contribute to the formation of atp from adp in the electron transport chain? a. high-energy electrons interact with pyruvic acid to create a phosphate bond with adp, forming atp. b. high-energy electrons supply the needed energy to synthesize atp from the lower-energy adp in the electron transport chain. c. high-energy electrons supply a negative charge which causes the citric acid to oxidize, forming a phosphate group to bond with adp. d. high-energy electrons increase the temperature of adp so it easily reacts to form atp.