Engineering Questions with Answers - Multiple Choice Questions

MCQs on Cell Signaling

1 - Question

Which of the following signal molecule is NOT used for extracellular signaling?
a) Autocrine
b) Endocrine
c) Paracrine
d) Cyclic AMP

View Answer

Answer: d
Explanation: Extracellular signaling in animals is carried out by four categories of signal molecules endocrine, paracrine, autocrine, and juxtacrine signaling. Cyclic AMP is a secondary messenger used for intracellular signaling.




2 - Question

. In endocrine signaling, the signal molecule act on target cell only in close proximity.
a) True
b) False

View Answer

Answer: b
Explanation: Endocrine signaling always acts on the distant target cell or that cell which located distantly from their site of synthesis while paracrine signaling is used for the cells which are located in close proximity.




3 - Question

Arrange the following sequence of extracellular signaling in the correct order?
1) Transport of signal to a target
2) Start of signal transduction pathways
3) Signaling cell synthesize and release signaling molecules
4) Binding of the signal to the specific receptor
a) 2, 3, 4, 1
b) 3, 1, 4, 2
c) 1, 2, 3, 4
d) 1, 3, 4, 2

View Answer

Answer: b
Explanation: Specific extracellular signaling molecules are defined for each cell. Extracellular signaling involves the synthesis and release of signal molecules, which bind to the specific receptor and initiate signal transduction pathway.




4 - Question

Which of the following signaling pathway is followed by T-lymphocytes in response to antigenic stimulation?
a) Autocrine signaling
b) Juxtacrine signaling
c) Paracrine signaling
d) Endocrine signaling

View Answer

Answer: a
Explanation: Signaling pathway in which signal molecules affect the same cell that produces it is called autocrine signaling. In response to antigenic stimulation, T-lymphocytes synthesize a growth factor which derives its own proliferation and amplifies the immune response.




5 - Question

Name the signaling which requires physical contacts between the cells involved.
a) Paracrine signaling
b) Intracellular signaling
c) Autocrine signaling
d) Juxtacrine signaling

View Answer

Answer: d
Explanation: Juxtracrine signaling is different from another signaling as it requires physical contact between the cells, these signals neither travel to distant target nor act on the same cell.




6 - Question

. Mark the signal molecule which does not interact with cell surface receptor.
a) Insulin
b) Glucagon
c) Testosterone
d) Gastrin

View Answer

Answer: c
Explanation: Testosterone is a steroid hormone which can easily traverse cytosolic membrane and interact with a nuclear receptor or cytosolic receptor.




7 - Question

Name the largest family of cell surface receptor?
a) GPCR
b) Ion-channel receptor
c) Enzyme-linked receptor
d) Nuclear receptor

View Answer

Answer: a
Explanation: GPCR is a G-protein coupled receptor; it requires G-protein for transmission of signals to the intracellular receptor. It is present in all eukaryotes and it includes receptors which are responsible for smell, light, and taste.




8 - Question

Which of the following G-protein takes part in the regulation of vision?
a) Gs family
b) Gi family
c) Gq family
d) Golf

View Answer

Answer: b
Explanation: G-protein which takes part in vision is Gt or transducin. Transducin is GTP-binding protein and is trimeric in nature




9 - Question

Name the family of monomeric G-protein which regulates the growth of the cell?
a) Ras
b) Rab
c) Ran
d) Rho

View Answer

Answer: a
Explanation: Ras is a monomeric G-protein which controls the growth of the cell through serine-threonine protein kinases. Ras works in a cyclic manner from inactive GDP-bound form to active GTP-bound form.

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