Openstax Concepts Biology Chapter 9

Which is the correct order for these steps in cell signaling?

• receptor activation, signal transduction, response

• response, signal transduction, termination

• receptor activation, response, signal transduction

• signal transduction, receptor activation, response

Signaling pathways have been conserved in a wide range of organisms.

• true

• false

A cell can only respond to signals from other cells, not from the physical environment.

• true

• false

Which type of cellular activities can be a response to cell signaling?

• Cell signals are released to communicate with other cells.

• All of these choices are correct.

• Gene expression patterns are changed.

• Enzyme activities are changed.

A cell that responds to an environmental condition by the release of a chemical is an example of which element of cellular communication?

• a signaling molecule

• a responding cell

• a receptor protein

• a signaling cell

A chemical that binds to a cell and causes its activity to change is an example of which element of cellular communication?

• a signaling cell

• a responding cell

• a receptor protein

• a signaling molecule

Which signaling system involves the longest distance between release of a signaling molecule and activation of a receptor?

• autocrine

• endocrine

• contact-dependent

• paracrine

Cell signaling between two nerve cells can be thought of as an example of paracrine signaling because:

• a receptor is activated.

• the responding cell releases more signaling molecule (neurotransmitter).

• a signaling molecule (neurotransmitter) is released.

• the cells are in close proximity.

Which of the answer choices correctly lists the types of cellular communication from shortest to longest distance traveled by the signaling molecule to reach its responding cell?

• endocrine, paracrine, autocrine

• autocrine, paracrine, endocrine

• paracrine, autocrine, endocrine

• autocrine, endocrine, paracrine

Mammalian steroid hormones are signaling molecules that function in which type of cell signaling?

• All of these choices are correct.

• endocrine

• autocrine

• paracrine