Which of the following are the basic categories of chemical signaling found in multicellular organisms?

(a) Paracrine signaling

(b) Autocrine signaling

(c) Endocrine signaling

(d) All of the above

Sol: (d) All of the above.

Cell signaling is __________.

(a) Intercellular

(b) Intracellular

(c) Both (a) and (b)

(d) None of the above

Sol: (c) Both (a) and (b).

Which of the following signaling is involved in Paracrine signaling?

(a) Chemical signaling

(b) Synaptic transmission

(c) Hormonal Communication

(d) Autostimulation of cell

Sol: (a) Chemical signaling.

Which of the following statements is true about cell signaling?

(a) In plants, the cell signaling occurs through phytohormones

(b) Cell signaling is used to study the context of human diseases

(c) Cell signaling is used to study the signaling between cells of an organism

(d) All of the above

Sol: (d) All of the above.

Which of the following signal molecules is not used for extracellular signaling?

(a) Autocrine

(b) Endocrine

(c) Cyclic AMP

(d) None of the above

Sol: (c) Cyclic AMP