AP Biology Unit 4 Review

Front

What is the role of cyclin in the cell cycle?

Back

Cyclin interacts with cyclin-dependent kinase (CdK) to initiate the mitotic phase of the cell cycle.

Front

Which phase of the cell cycle is the longest?

Back

Interphase is the phase where the cell spends the greatest amount of time.

Front

What type of feedback mechanism is represented by the release of ADH when dehydrated?

Back

Negative feedback is the mechanism that regulates the release of ADH to increase water absorption.

Front

What is the function of secondary messengers in cell signaling?

Back

Secondary messengers activate or deactivate enzymes during the transduction step of cell signaling.

Front

How does the DNA content of daughter cells compare to the parent cell after cytokinesis?

Back

Daughter cells have the exact same amount of DNA as the original parent cell.

Front

What is the function of CdK in the cell cycle?

Back

CdK (cyclin-dependent kinase) is activated by cyclin to phosphorylate target proteins, driving the cell cycle forward.

Front

What occurs during the S phase of the cell cycle?

Back

During the S phase, DNA replication occurs, resulting in two identical sets of chromosomes.

Front

Define interphase in the context of the cell cycle.

Back

Interphase is the phase of the cell cycle where the cell grows, duplicates its DNA, and prepares for mitosis.

Front

What is the significance of feedback mechanisms in biological systems?

Back

Feedback mechanisms help maintain homeostasis by regulating physiological processes.

Front

What is the difference between positive and negative feedback?

Back

Positive feedback amplifies a response, while negative feedback reduces or inhibits a response.