MCQ on Cell Signaling

MCQ on Cell Signaling

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

Which of the following signal molecules does not interact with cell surface receptors?

(a) Insulin

(b) Gastrin

(c) Glucagon

(d) Testosterone

Sol: (d) Testosterone.

Which of the following G-protein takes part in the regulation of vision?

(a) Golf

(b) Gi family

(c) Gs family

(d) Gq family

Sol: (b) Gi family

The signaling pathway, followed by T-lymphocytes in response to antigenic stimulation, is _______.

(a) Endocrine signaling

(b) Paracrine signaling

(c) Autocrine signaling

(d) Juxtacrine signaling

Sol: (c) Autocrine signaling.

Extracellular signaling in animals is carried out by _________.

(a) Autocrine signaling

(b) Endocrine signaling

(c) Juxtacrine signaling

(d) All of the above

Sol: (d) All of the above.

How many types of cell signalings are there?

(a) Four

(b) Five

(c) Seven

(d) Eight

Sol: (a) Four.

Which of the following statements is true about the paracrine messenger molecules?

(a) The messenger molecules are large

(b) The messenger molecules are short

(c) The messenger molecules are stable

(d) The messenger molecules are unstable

Sol: (d) The messenger molecules are unstable.

Which of the following messenger molecules are derived from arachidonic acid?

(a) Steroids

(b) Corticoids

(c) Terpenoids

(d) Eicosanoids

Sol: (d) Eicosanoids.

How many transmembrane alpha-helices are present in the G-protein coupled receptors?

(a) Two

(b) Four

(c) Five

(d) Seven

Sol: (d) Seven

Steroids, a biologically active organic compound, are derived from ______.

(a) Hormones

(b) Chemicals

(c) Cholesterol

(d) Carbohydrates

Sol: (c) Cholesterol.

Which of the following signaling molecules are used by simple nerve reflexes?

(a) Proteases

(b) Nitric oxides

(c) G proteins

(d) Neurotransmitters

Sol: (d) Neurotransmitters

Which of the following statements is not true about G proteins?

(a) G proteins are involved in signal cascades

(b) G proteins become activated when bound to GDP

(c) Guanine nucleotides regulate G proteins

(d) None of the above

Sol: (b) G proteins become activated when bound to GDP

Which of the following is a cell surface receptor?

(a) Enzyme-linked receptors

(b) G protein-linked receptors

(c) Ion-channel linked receptors

(d) All of the above

Sol: (d) All of the above.

Which of the following statements is true about cell signaling?

(a) In multicellular organisms, cell communicate using hormones

(b) In unicellular organisms, cell communicate using extracellular signaling molecules

(c) In multicellular organisms, cell communicate using intracellular signaling molecules

(d) None of the above

Sol: (a) In multicellular organisms, cell communicate using hormones

The hormone, also called the ligand is considered as_________.

(a) First messenger

(b) The Second messenger

(c) Both (a) and (b)

(d) None of the above

Sol: (a) First messenger

Which of the following hormones requires a cell surface receptor for its action?

(a) Adrenaline

(b) Progesterone

(c) Growth factors

(d) All of the above

Sol: (a) Adrenaline