AP Biology Unit 4 review

Front

What occurs when the ligand binds to the receptor?

Back

Confirmation change in shape of receptor.

Front

What type of feedback loop do mammals use to maintain a constant body temperature?

Back

Negative feedback loop.

Front

Which of the following is NOT a response by the cell from a signal transduction pathway?

Back

All of the above are responses (cell growth, gene expression, secretion of molecules).

Front

What is the stage where the cell no longer divides?

Back

G0 phase.

Front

Which component is NOT involved in the transduction step of a signal transduction pathway?

Back

Ligands.

Front

Define signal transduction pathway.

Back

A series of molecular events and reactions that lead to a cellular response after a signal is received.

Front

What is homeostasis?

Back

The process by which living organisms regulate their internal environment to maintain stable, constant conditions.

Front

What is the role of secondary messengers in signal transduction?

Back

They amplify the signal and help relay it within the cell.

Front

What is phosphorylation cascade?

Back

A series of events where one protein kinase activates another, leading to a cellular response.

Front

What is the difference between positive and negative feedback loops?

Back

Positive feedback amplifies a response, while negative feedback reduces it to maintain balance.