Which of the following is an example of passive transport across the cell membrane?
A. the stimulation of a muscle cell
B. the uptake of glucose by the microvilli of cells lining the stomach
C. the movement of insulin across the cell membrane
D. the movement of carbon dioxide across the cell membrane
E. the selective uptake of hormones across the cell membrane

Chlorophyll is found in plant leaves and absorbs light from the sun to enable plants to perform photosynthesis. magnesium is an important component of chlorophyll. the concentration of magnesium ions is higher in the root-hair cells of plants than in the soil. which mechanism of ion uptake would best enable a plant to produce a steady supply of chlorophyll? osmosis diffusion passive transport active transport

Which of the following is not considered an appendage of the skin? nails glands follicles none of the above

Cassandra made a venn diagram to compare and contrast the two stages of cellular respiration. which belongs in the area marked x? energy is released. oxygen is used up. glucose is broken down. carbon dioxide is used up.