Unit 4: Cell Communication & The Cell Cycle Review

Front

What is positive feedback in biological systems?

Back

A process in which an initial change will bring about more change in the same direction, enhancing the effect.

Front

What happens to a cell that undergoes mitosis without cytokinesis?

Back

The resulting cell will have more than one nucleus.

Front

Where can receptors for signal molecules be found?

Back

Receptors can be found in the plasma membrane and in the cytoplasm/nucleus.

Front

What is an example of a negative feedback loop?

Back

Body maintaining a temperature of about 37°C.

Front

What activates a G protein?

Back

A G protein is active when GTP is bound to it.

Front

What is the role of negative feedback in homeostasis?

Back

Negative feedback helps maintain stability by counteracting changes.

Front

What is cytokinesis?

Back

The process that divides the cytoplasm of a parental cell into two daughter cells after mitosis.

Front

What is the function of protein kinases in cell signaling?

Back

Protein kinases phosphorylate target proteins, which can activate or deactivate signaling pathways.

Front

What is the significance of ion channels in cell communication?

Back

Ion channels allow specific ions to enter or exit the cell, contributing to changes in membrane potential and signaling.

Front

What is the difference between autocrine and paracrine signaling?

Back

Autocrine signaling involves a cell responding to signals it produces itself, while paracrine signaling involves signals affecting nearby cells.