Question

Which statements are examples of cell signaling?

Thyroid hormone stimulates body cells to increase metabolic activity.

Yeast cells produce and respond to mating factors to recognize mates and initiate mating.

Carbon dioxide diffuses across the cell membrane into the blood plasma.

After an injury, platelets produce growth factors to stimulate nearby cells to divide.

Chlorophyll absorbs and transfers light energy during photosynthesis.

Answer 1

cell signaling involving a ligand binding to the receptors in the cell ( if the ligand is hydrophilic receptor is located on the plasma membrane and if the ligand is hydrophobic the receptor can be found in the cytoplasm), the ligand-binding results in signaling cascade in the cell.

The thyroid hormone binds to a receptor in the cytosol and the receptor-ligand complex moves into the nucleus and changes the gene expression.

mating factors secreted by yeast cells induce cell signaling in the mates to initiate the mating.

the growth factors produced by the platelets induce cell signaling in the nearby cells.

the diffusion of carbon dioxide is just the movement of carbon dioxide based on the concentration gradient, chlorophyll absorbs light and transfers energy during photosynthesis is part of the electron transport chain.

so the answers are

Thyroid hormone stimulates body cells to increase metabolic activity.

Yeast cells produce and respond to mating factors to recognize mates and initiate mating.

After an injury, platelets produce growth factors to stimulate nearby cells to divide.