Cell Signalling and Transduction – Section 1

26. Which of the following is a second messenger?

A. lnositol 1,4,5-triphosphate
B. Diacyl glycerol
C. Phospholipase C
D. Both (a) and (b)

Correct Answer: D. Both (a) and (b)

27. Which of the following statement is incorrect?

A. The principal lipophilic hormones that binds to receptors located in the plasma membranes are prostaglandins
B. Prostaglandins are synthesized from arachidonic acid
C. Prostaglandins act as paracrine signaling molecules
D. None of the above

Correct Answer: D. None of the above

28. Two key organizing principles for large multicellular organisms are

A. prokaryotic cell structure and cell specialization
B. cell specialization and communication between cells
C. communication between cells and simple nerve reflexes
D. simple nerve reflexes and cell specialization

Correct Answer: B. cell specialization and communication between cells

29. Which of the following is a hormone whose action requires a cell surface receptor?

A. Nitric oxide
B. Progesterone
C. Adrenaline
D. Growth factors

Correct Answer: C. Adrenaline

30. The hormone or ligand can be considered as

A. first messenger
B. second messenger
C. both (a) and (b)
D. none of these

Correct Answer: A. first messenger

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