Which of the following is/are true? (Select ALL that are TRUE.) Question 3 optio

Question

Which of the following is/are true? (Select ALL that are TRUE.)

Question 3 options:

a)

Paracrine signaling occurs through diffusible ligands that are secreted into the bloodstream.

b)

Stress-gated channels are opened in response to diffusible ligands binding to the channel.

c)

Contractile vacuoles are needed in plant cells to expel excess water that moves into the cell.

d)

The Notch receptor and the Delta ligand are both transmembrane proteins that can bind to each other only when the signaling cell is in direct contact with the receiving cell.

e)

In Drosophila, embryos that die due to mutations that eliminate either the Notch receptor or the Delta ligand contain an excess number of neural cells and too fewepidermal cells.

a)

Paracrine signaling occurs through diffusible ligands that are secreted into the bloodstream.

b)

Stress-gated channels are opened in response to diffusible ligands binding to the channel.

c)

Contractile vacuoles are needed in plant cells to expel excess water that moves into the cell.

d)

The Notch receptor and the Delta ligand are both transmembrane proteins that can bind to each other only when the signaling cell is in direct contact with the receiving cell.

e)

In Drosophila, embryos that die due to mutations that eliminate either the Notch receptor or the Delta ligand contain an excess number of neural cells and too fewepidermal cells.

Explanation / Answer

a is false, as paracrine signals are introduced in the immediate extracellular environment. endocrine signal travel via circulation

b is false, stress gated function by mechanical signals

c is false as CV are generally found in protists such as amoeba or algae which live in aquatic environments and hence the need

d is true as a transmembrane delta ligand binds to the transmembrane notch receptor on the outside, when the two cells are in proximity

e is false Notch is involved in neurogenesis and epidermal differentiation

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